Unable to load DLL SQLite Interop dll

Question

Periodically I am getting the following exception   Unable to load DLL  SQLite Interop dll   The specified module could not be found   Exception from HRESULT  0x8007007E   I am using 1 0 82 0  version  installing it with nuget in VS2010  OS Win7 64   Once exception starts to appear  it appears constantly - in debug and release and running application within or outside VS   The only way to stop it is logoff and logon  The exception is not thrown and dll is loaded  It can work for days  but then it can break again    Has anyone seen something like this and is there a solution for it

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I don t know if it s a good answer  but I was able to solve this problem by running my application under an AppDomain with an identity of  Local System

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I had this problem because Visual C   2010 redistributable no installed in my PC if you have not already installed Visual c   2010 redistributable Download and install this check x86 or 64 dll

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I wanted to posted here because of the complexity of this problem  My solution was to roll back to  Net 4 0  I have been testing for 3 days and have not been able to get System Data SQLite Core 1 0 98 0 to work with  Net 4 5 or  Net 4 5 1   The testing was exhaustive on 3 computers  2 servers one dev PC  I have not been able to get to the source of the issue  I have tried editing the  vsproj file  I have added the SQLite interop dll to all folders practically  I have applied the package to all GAC folders  and removed and reapplied individually  Eventually removed    I do have System Data SQLite Core 1 0 98 0 working with  Net 4 0  I intend to continue to attempt the migration  but I think I will start a new project first and see if I can get it to work in that fashion  This was originally a  Net 3 5 web app  and in my travels I found a good amount of information still referencing that framework

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I had the same issue  Please follow these steps   Make sure you have installed System Data SQLite Core package by SQLite Development Team from NuGet  Go to project solution and try to locate build folder inside packages folder Check your project framework and pick the desired SQLite Interop dll and place it in your debug release folder  Reference

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Copy SQLite Interop dll in project directory   src    project        bin     lt -- Past in bin          x64             SQLite Interop dll  lt -- Copy this if 64          x86             SQLite Interop dll  lt -- Copy this if 32

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Just worked this for me   Install-Package System Data SQLite Core on Package Manager Console

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I know I m late to the party but I had this issue right after I pulled down latest x86 x64 today  version 1 0 88 0   My local IIS in VS2012 runs 32bit by default and there s no easy way to switch to x64  My production server runs 64bit   Anyway I installed the NuGet package to a DLL project and I got this error  What I had to do to get it working I had to install it to the main site project  too  Even if it doesn t touch SQLite classes at all   My guess is that SQLite uses the entry assembly to detect which version of Interop to load

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Mine didn t work for unit tests either  and for some reason Michael Bromley s answer involving DeploymentItem attribute didn t work  However  I got it working using test settings  In VS2013  add a new item to your solution and search for  settings  and select the  Test Settings  template file  Name it  SqliteUnitTests  or something and open it  Select  Deployment  off to the right  and add Directory File  Add paths directories to your SQLite Interop dll file  For me  I added two paths  one each for Project bin Debug x64 and Console bin Debug x86  You may also want to add your Sqlite file  depending on how you expect your unit test solution to access the file

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I ran across this problem  in a solution with a WebAPI MVC5 web project and a Feature Test project  that both drew off of the same data access  or   Core   project   I  like so many others here  am using a copy downloaded via NuGet in Visual Studio 2013   What I did  was in Visual Studio added a x86 and x64 solution folder to the Feature Test and Web Projects   I then did a Right Click   Add Existing Item     and added the appropriate SQLite interop dll library from    SolutionFolder packages System Data SQLite Core 1 0 94 0 build net451  appropriate architecture  for each of those folders   I then did a Right Click   Properties  and set Copy to Output Directory to Always Copy   The next time I needed to run my feature tests  the tests ran successfully

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Updating NuGet from Tools - gt  Extension and updates and reinstalling SQLite Core with the command PM gt  Update-Package -reinstall System Data SQLite Core fixed it for me

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When you get in this state  try performing a Rebuild-All  If this fixes the problem  you may have the same issue I had   Some background  my understanding     SQLite has 1 managed assembly  System Data SQLite dll  and several platform specific assemblies  SQLite Interop dll   When installing SQLite with Nuget  Nuget will add the platform specific assemblies to your project  within several folders   x86   x64   and configures these dlls to  Copy Always   Upon load  the managed assembly will search for platform specific assemblies inside the  x86 and  x64 folders  You can see more on that here  The exception is this managed assembly attempting to find the relevant  SQLite Interop dll  inside these folders  and failing     My Scenario   I have 2 projects in my solution  a WPF app  and a class library  The WPF app references the class library  and the class library references SQLite  installed via Nuget     The issue for me was when I modify only the WPF app  VS attempts to do a partial rebuild  realizing that the dependent dll hasn t changed   Somewhere in this process  VS cleans the content of the  x86 and  x64 folders  blowing away SQLite Interop dll   When I do a full Rebuild-All  VS copies the folders and their contents correctly   My Solution   To fix this  I ended up adding a Post-Build process using xcopy to force copying the  x86 and  x64 folders from the class library to my WPF project  bin directory   Alternatively  you could do fancier things with the build configuration   output directories

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So  after adding the NuGet the deployment doesn t copy down the Interops   You can add this to your csproj file and it should fix that behavior     lt PropertyGroup gt        lt ContentSQLiteInteropFiles gt true lt  ContentSQLiteInteropFiles gt       lt CopySQLiteInteropFiles gt false lt  CopySQLiteInteropFiles gt       lt CleanSQLiteInteropFiles gt false lt  CleanSQLiteInteropFiles gt       lt CollectSQLiteInteropFiles gt false lt  CollectSQLiteInteropFiles gt    lt  PropertyGroup gt    If you look in the source for NuGet for SQLite you can see what these are doing specifically   This allowed me to get a deploy working with ASP Net Core

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If you download correct binary for SQLite then copy SQLite Interop dll into your Release or Debug folder according to your project build option

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I ve struggled with this for a long time  and  occasionally  I found that the test setting is incorrect  See this image    I just uncheck the test setting  and the issue disappears  Otherwise  the exception will occurs  Hopefully  this will help someone  Not sure it s the root cause

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In short  To get this to work also with NCrunch I had to add the Interop dll versions provided with the NuGet package as additional files in NCrunch configuration   My case  I had a C  solution with one project directly depending on SQLite  a helper library  and a unit test project that used this helper library  I had installed System Data SQLite Core version 1 0 97 0 as a NuGet package    In my case the workaround provided by Marin got it working in Visual Studio and in CI as well  However this would still provide errors in NCrunch   In NCrunch configuration I added the following path in  Additional files to include  under the unit test projects settings      packages System Data SQLite Core 1 0 97 0 build net45    dll

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I encountered this problem myself  but it turned out to be another cause   System DllNotFoundException was caught  Unable to load DLL  SQLite Interop dll   Access is denied     In this case  the code was  indirectly  called from a web-service hosted by IIS  configured for x86 build    I finally tracked it down to the Application Pool in IIS   Originally I was using  ASP NET V4 0 Integrated   which resulted in that error   but when I changed it over to  DefaultAppPool   the problem went away    Phew

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My situation was a little unique  I was running an application inside a docker container and kept getting the following error      System DllNotFoundException   Unable to load shared library  SQLite Interop dll  or one of its dependencies  In order to help diagnose loading problems  consider setting the LD DEBUG environment variable  libSQLite Interop dll  cannot open shared object file  No such file or directory   So I set LD DEBUG libs to find out what folders System Data SQLite dll was looking in to find SQLite Interop dll    You can find info on setting LD DEBUG here  http   www bnikolic co uk blog linux-ld-debug html  Once I did that I realized that SQLite Interop dll was being found just fine  The DLL that wasn t being found was libSQLite Interop dll  I should have read the entire error message    Hours of Googling later I found this guide on how to compile the missing DLL from the SQLite source code    Note that the file that was actually missing was libSQLite Interop dll so  Anyway when you compile the source code you get libSQLite Interop so which you need to rename to libSQLite Interop dll so and put it in the directory that it s looking in which you can find by setting LD DEBUG    For me the directory that System Data SQLite dll was looking in was  usr lib x86 64-linux-gnu

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In the Nuget package of SQLLite Core there is a the file System Data SQLite Core targets   Just include this in all projects that use the this library and all libraries that used your library   In yours  csproj or  vbproj files add   Every time you compile in your bin will added x86 and x64 directory with the SQLite Interop dll file

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So  my issue was that SQLite was trying to load at design-time in WPF   Since I cared only about x86 environment  I set the CPU preference to that and copied SQLite Interop dll from the Nuget package to the root directory of the solution   Restarted the solution and all problems disappeared   So  if you re having design-time issues  put the library into the root directory of your solution   Additionally  I was getting a similar issue during runtime  so I had to place a copy of SQLite Interop dll into my project and set it to copy if it s newer in the properties   It appears that x86 and x64 folders provided are completely useless   Further investigation is required  but overall    it s just easier to manually reference SQLite in your project than to use a Nuget package   Additionally  the official FAQ states the following       20  When the System Data SQLite project is compiled and run from   inside Visual Studio  why do I get a DllNotFoundException or a   BadImageFormatException  for  sqlite3 dll  or  SQLite Interop dll     when trying to run or debug the application       When compiling and running a solution from within Visual Studio that   uses the System Data SQLite project  including the test project   it   is very important to select the correct build configuration and   platform  First  managed applications to be debugged inside Visual   Studio cannot use the mixed-mode assembly  i e  because it is always   compiled to the platform-specific build output directory   This is   necessary to properly support building binaries for multiple platforms   using the same source project files  Therefore  only the    DebugNativeOnly  or  ReleaseNativeOnly  build configurations should   be selected when running a managed application from inside Visual   Studio that relies upon the System Data SQLite assembly  These build   configurations contain a custom post-build step that copies the   required native assembly to the managed output directory  i e  to   enable running the managed binaries in-place   However  this   post-build step will only be performed if the selected platform   matches that of the operating system  e g   Win32  for 32-bit Windows   and  x64  for 64-bit Windows   Therefore  it is good practice to   double-check the selected build platform against the operating system   prior to attempting to run a managed project in the solution    https   system data sqlite org index html doc trunk www faq wiki q20

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For reference for anyone looking at this question   If you use the nuget package  it installs a build rule that does the copying for you   see under System Data SQLite Core 1 0 94 0 build - or whatever version of Core you install    The nuget installer adds the rule to your project file automatically   This still doesn t fix the test case problem though  The DeploymentItem  https   stackoverflow com a 24411049 89584  approach is the only thing that seems to work there

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I am working on a simple console application to add some test data to an SQLite database and was getting this error  The configuration for the project is  Any CPU   I fixed it by copying the SQLite Interop dll to the bin debug folder  A better way would be to use the method by  Wil  but how do you specify this for  Any CPU  configuration

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I had a similar issue in a multiple projects solution  The SQLite Interop dll was necessary for one of the plugins distributed with the software using ClickOnce   As far as debugging in visual studio everything worked fine  but the deployed version was missing the folders x86  and x64  containing that DLL   The solution to have it work after deployment using ClickOnce was to create in the startup project of the solution  also the one being published  these two subfolder  copy into them the DLLs and set them as Content Copy Always   This way the ClickOnce publishing tool automatically includes these files and folders in the manifest and deploys the software with them

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There are really a lot of answers here  but mine is simple and clear with no-GAC-playing-around  The problem was  the executable File needs a copy of the right SQLite Interop dll  x86 or x64  to access our Database  Mostly architectures have layers and in my case the Data Layer has the required DLL for SQLite Connection  So i simple put a post build script into my Data Layer Solution and everything worked fine   TL DR   Set all Projects of your solution to x86 or x64 in the build options   Add following Post-Build-Script to the Project with the SQLite nuget Package  xcopy   quot   TargetDir x64 quot   quot   SolutionDir bin Debug  quot   y   Of course you have to change the script for Release Build and x86 builds   STL DR  Put your SQLite Interop dll next to the   exe File

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As the SQLite wiki says  your application deployment must be     So you need to follow the rules  Find dll that matches your target platform and put it in location  describes in the picture  Dlls can be found in YourSolution packages System Data SQLite Core  version      I had problems with application deployment  so I just added right SQLite Interop dll into my project  the added x86 folder to AppplicationFolder in setup project and added file references to dll

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I have started using Costura Fody to package   net  assemblies and embed and preload native dlls  This also helps later  with distribution as you can send one file    Install Costura Fody from Nuget   In your C  project create a folder called costrua32  In there add any native dlls you which C  to load   Once you have added them to this folder  Click on the properties window and change build action to  Embedded Resource  Finally you need to amend the XML file called FodyWeavers xml as follows  Here I am specifying load the sql dll first   note you drop the  dll   Weavers  Costura   PreloadOrder    SQLite Interop    tbb debug    tbb    PreloadOrder gt    Costura  Weavers    The advantage of this is that you do not have to write any pre or post build events  and the end product is totally encapsulated in to one larger file

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I had this same problem when using SQLite in a WPF project whose platform target was Any CPU  I fixed it by following the following steps    Open the project designer in Visual Studio  Details on how to do it can be found here  Click on the Build tab  Disable the prefer 32-bit option    Alternatively  you could just set the platform target to x86 or x64  I think this problem is caused by the System Data SQLite library using the platform target to get the location of the  SQLite Interop dll  file   UPDATE   In case the project designer cannot be reached  just open the project    csproj  file from a text editor and add the value  lt Prefer32Bit gt false lt  Prefer32Bit gt  into the  lt PropertyGroup gt     lt  PropertyGroup gt  tag   Example code   lt PropertyGroup gt       lt Configuration Condition      Configuration           gt Debug lt  Configuration gt       lt Platform Condition      Platform           gt AnyCPU lt  Platform gt       lt ProjectGuid gt  Set by Visual Studio  lt  ProjectGuid gt       lt OutputType gt Exe lt  OutputType gt       lt AppDesignerFolder gt Properties lt  AppDesignerFolder gt       lt RootNamespace gt  Set by Visual Studio  lt  RootNamespace gt       lt AssemblyName gt  Set by Visual Studio  lt  AssemblyName gt       lt TargetFrameworkVersion gt v4 5 lt  TargetFrameworkVersion gt       lt FileAlignment gt  Set by Visual Studio  lt  FileAlignment gt       lt  --Add the line below to your project file  Leave everything else untouched-- gt       lt Prefer32Bit gt false lt  Prefer32Bit gt   lt  PropertyGroup gt

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Try to set the platform target to x86 or x64  and not Any CPU  before you build  Project- Properties- Build- Platform target in Visual Studio

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old project file format  i e  projects beginning with  lt Project ToolsVersion  3 5  DefaultTargets  Build  xmlns  http   schemas microsoft com developer msbuild 2003  gt   Add the following to your csproj on your  main  root project   lt PropertyGroup gt        lt ContentSQLiteInteropFiles gt true lt  ContentSQLiteInteropFiles gt       lt CopySQLiteInteropFiles gt false lt  CopySQLiteInteropFiles gt       lt CleanSQLiteInteropFiles gt false lt  CleanSQLiteInteropFiles gt       lt CollectSQLiteInteropFiles gt false lt  CollectSQLiteInteropFiles gt   lt  PropertyGroup gt    new SDK project file format  i e  projects beginning with  lt Project Sdk  Microsoft NET Sdk    gt   Add PrivateAssets  none  to each ProjectReference PackageImport in the dependency chain down to the System Data Sqlite PackageImport   ex    lt PackageReference Include  System Data SQLite Core  Version  1 0 110  PrivateAssets  none   gt

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Also added the dll to the test project  through Nuget Manager  and it fixed it

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The default installation of the multi-architecture  x86  x64  version of SQLite from NuGet exhibits the behavior that you described   If you would like to load the correct version for actual architecture that the  NET runtime chose to run your application on your machine  then you can give the DLL loader a hint about where to locate the correct library as follows   Add a declaration for the kernel32 dll function call to SetDLLDirectory   before your Program Main          System Runtime InteropServices DllImport  kernel32 dll   CharSet   System Runtime InteropServices CharSet Unicode  SetLastError   true        return  System Runtime InteropServices MarshalAs System Runtime InteropServices UnmanagedType Bool       static extern bool SetDllDirectory string lpPathName     Then use your own method for determining the correct subdirectory to find the architecture specific version of  SQLite Interop dll    I use the following code        STAThread      static void Main                 int wsize   IntPtr Size          string libdir    wsize    4   x86   x64           string appPath   System IO Path GetDirectoryName Application ExecutablePath           SetDllDirectory System IO Path Combine appPath  libdir

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My application is a web application  ASP NET MVC  and I had to change the application pool to run under LocalSystem instead of ApplicationPoolIdentity  To do this    Open IIS Manager Find the Application Pool your site is running under  Click Advanced Settings from the actions Change Identity to LocalSystem   I have no idea why this fixes the issue

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Copy  SQLite Interop dll  files for both x86 and x64 in debug folder  these files should copy into  x86  and  x64 folders in debug folder

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You could also get this error if you are trying to run a 32 bit dll  in a 64 bit project    I got this when I have placed the same file SQLite Interop dll in 32 bit version  in both the x86 and x64 folder

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Could there be contention for the assembly   Check to see whether there s another application with a file lock on the DLL     If this is the reason  it should be easy to use a tool like Sysinternal s Process Explorer to discover the offending program   HTH  Clay

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This is what worked for me   With Visual Studio open  search and install SQLite Core via the NUGET Package manager  Go to Solution Explorer in VS  Right click your PROJECT NAME-- gt ADD-- gt NEW FOLDER Name the folder x64 Repeat the process and add folder and name it x86 Right click the x64 folder-- gt ADD-- gt EXISTING ITEM Then browse to the DEBUG FOLDER  You will find the x64 folder  Open it and select the  quot SQLite Interop dll quot  file then hit OK  Repeat step 5 for the x86 folder  Right click the DLL that you just added and select PROPERTIES  In the option Copy to Output Directory  choose Copy always  Repeat step 7 for both DLLs in x64 and x86 folder   Next time you build the project and take to another computer  it should work fine

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even if it is an old post  I d like to share the solution that I found here  http   system data sqlite org index html info 54e52d4c6f  If you don t want to read all the issue  the solution is to copy the file  msvcr100 dll   that can be found in Windows System32 directory  in the same path as SQLite Interop dll   I would advice to read the issue to understand why  and to include the file in your setup but to install it only if the error occurs  I made it an optional component selectable in the setup options   HTH  Formentz

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This is how I fixed it in my project   It was working  and when a colleague submitted his changes  I received the  Unable to load DLL  SQLite Interop dll   exception   Diffing the project s  csproj file  this was in the NON-WORKING version    lt ItemGroup gt        lt Content Include  x64 SQLite Interop dll    gt        lt Content Include  x86 SQLite Interop dll    gt   lt  ItemGroup gt    And this is what the WORKING version had    lt ItemGroup gt        lt Content Include  x64 SQLite Interop dll  gt             lt CopyToOutputDirectory gt Always lt  CopyToOutputDirectory gt         lt  Content gt         lt Content Include  x86 SQLite Interop dll  gt             lt CopyToOutputDirectory gt Always lt  CopyToOutputDirectory gt         lt  Content gt   lt  ItemGroup gt    After reverting back  I didn t receive the exception   The DLL files were dumped in the appropriate Debug x64  etc  folders

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I don t know why this has not been included yet  but I had to do the research and find this out for myself  so hopefully someone will find this answer and be saved the trouble   This was for a WPF app   It worked fine on my Dev box  but did not work on the computer where I was copying it and got the Unable to load DLL  SQLite Interop dll  error   I ported over all of its associated directories and files  directly from my  Debug  folder to this other computer when I got the same error as the OP when I ran it   My  bin  folder that contained my DLLs had been copied to  Debug bin  and all were included  along with my application files when I did my copying to the other computer using this path  so it was not missing any files   Things I saw said in other answers that did not apply    I did not use the NuGet package or need to create x86 or x64 folders that it seems that NuGet package creates   My DLLs  System Data SQLite and SQLite Interop dll  along with System Data SQLite config  are in the  bin  folder in my project and were copied in manually  create  bin  folder in Solution Explorer in VS  paste DLLs into this folder in Windows Explorer  use Add   Existing Item to bring files into VS folder project    Then I reference them as Referenced Assemblies in my project using that location   References     Add Reference   and browse to one  rinse  repeat for the rest    This ensures my project knows exactly where they are  I did not need to reference any SQLite DLL file in my app config or even touch my  MyProject csproj file  I did not even need to specify a particular processor   My project s build is for  Any CPU   even though I have only mixed or 64-bit DLLs and will only be running on Windows 7   which are 64-bit OSes   no x86-only 32-bit solely DLLs  I was already specifying them as  Content  and  copy if newer  for these DLLs when I experienced the OP s error    What I found was this  from https   system data sqlite org index html doc trunk www faq wiki q20      11  Why do I get a DllNotFoundException  for  sqlite3 dll  or  SQLite Interop dll   when trying to run my application   Either the named dynamic link library  DLL  cannot be located or it cannot be loaded due to missing dependencies  Make sure the named dynamic link library is located in the application directory or a directory along the system PATH and try again  Also  be sure the necessary Visual C   runtime redistributable has been installed unless you are using a dynamic link library that was built statically linked to it   Emphasis mine on that bolded part inside the paragraph   The target computer was fresh and had no programs loaded except  NET 4 0   Once I installed C    it was able to complete the commands to SQLite   This should have been one of the first FAQs and part of the pre-requisities  but it was buried at  11   My development computer already had it loaded because it came with Visual Studio  so that s why it worked  there   Download  Visual C   Redistributable for Visual Studio 2015  https   www microsoft com en-us download details aspx id 48145  Update 3  cumulative update    https   www microsoft com en-us download details aspx id 53587

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You do need to install System Data SQLite Core via NuGet  If you use InnoSetup  make sure that you have the following lines in the  Files  section of the  iss file   Source   C  YourProjectPath bin Release x64     DestDir    app  x64   Flags  ignoreversion recursesubdirs createallsubdirs Source   C  YourProjectPath bin Release x86     DestDir    app  x86   Flags  ignoreversion recursesubdirs createallsubdirs   Change  YourProjectPath  for the path to your project

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I had the same issue running Visual Studio Express 2013  I tried several solutions mentioned here and elsewhere to no avail  I hope this fix helps others   I fixed it by using the DeploymentItem attribute on my test class that tests the SQLite-based service   Example    TestClass   DeploymentItem   x86 SQLite Interop dll    x86       this is the key public class LocalStoreServiceTests         TestMethod      public void SomeTestThatWasFailing DueToThisVeryIssue                         test code here           This causes the needed SQLite Interop dll to get copied to the x86 directory within the appropriate  TestResults  folder   All is green  All is good

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I got the same problem  However  finally  I can fix it   Currently  I use Visual Studio 2013 Community Edition   I just use Add- Existing Item    and browse to where the SQLite Data SQLite files are in  my case is  C  Program Files  x86  System Data SQLite 2013 bin     Please don t forget to change type of what you will include to Assembly Files    dll    pdb    Choose  SQLite Interop dll  in that folder   From there and then  I can continue without any problems at all   Good luck to you all      P S  I create web form application   I haven t tried in window form application or others yet

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I had this problem because a dll I was using had Sqlite as a dependency  configured in NuGet with only the Sqlite core package    The project compiles and copies all the Sqlite dll-s except the  SQLite Interop dll   both x86 and x64 folder   The solution was very simple  just add the System Data SQLite Core package as a dependency  with NuGet  to the project you are building running and the dll-s will be copied

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Expanding on Kugel   s answer which worked for me  VS2015 Enterprise  leveraging SQLite from a dll the Nuget package can be removed from the main project after building and testing   1 Install Nuget package to main project   Install-Package System Data SQLite   2 Build Application and test that your Sqlite connection is working   select   from sqlite master   3 Uninstall Nuget package from the main build   UnInstall-Package System Data SQLite   4 Manually remove the dll references for SQLite and EntityFramework   System Data SQLite System Data SQLite EF6 System Data SQLite Linq    Remove Xml references from the main project s    packages config    xml file          This worked for me and keeps my project clean

[c#] Unable to load DLL 'SQLite.Interop.dll'

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