Could not load file or assembly System Data SQLite

Question

I ve installed ELMAH 1 1  Net 3 5 x64 in my ASP NET project and now I m getting this error  whenever I try to see any page       Could not load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format       Description  An   unhandled exception occurred during   the execution of the current web   request  Please review the stack trace   for more information about the error   and where it originated in the code       Exception Details    System BadImageFormatException  Could   not load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format    More error details at the bottom   My Active Solution platform is  Any CPU  and I m running on a x64 Windows 7 on an x64  of course  processor  The reason why we are using this version of ELMAH is because 1 0  Net 3 5  x86  which is the only platform for which it s compiled  gave us this same error on our x64 Windows server   I ve tried compiling for x86 and x64 and I get the same error  I ve tried removing the all compiler output  bin and obj   Finally I ve made a reference to the SQLite dll directly  something that was not needed for the project to work on the server and I ve got this compiler error      Error 1 Warning as Error  Assembly generation -- Referenced assembly  System Data SQLite dll  targets a different processor MyProject   Any ideas what the problem might be   More error details      Source Error       An unhandled exception was generated   during the execution of the current   web request  Information regarding the   origin and location of the exception   can be identified using the exception   stack trace below       Stack Trace        BadImageFormatException  Could not   load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format     System Reflection Assembly  nLoad AssemblyName   fileName  String codeBase  Evidence   assemblySecurity  Assembly   locationHint  StackCrawlMark amp    stackMark  Boolean   throwOnFileNotFound  Boolean   forIntrospection   0   System Reflection Assembly nLoad AssemblyName   fileName  String codeBase  Evidence   assemblySecurity  Assembly   locationHint  StackCrawlMark amp    stackMark  Boolean   throwOnFileNotFound  Boolean   forIntrospection   43   System Reflection Assembly InternalLoad AssemblyName   assemblyRef  Evidence   assemblySecurity  StackCrawlMark amp    stackMark  Boolean forIntrospection     127    System Reflection Assembly InternalLoad String   assemblyString  Evidence   assemblySecurity  StackCrawlMark amp    stackMark  Boolean forIntrospection     142    System Reflection Assembly Load String   assemblyString   28   System Web Configuration CompilationSection LoadAssemblyHelper String   assemblyName  Boolean starDirective     46       ConfigurationErrorsException  Could   not load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format     System Web Configuration CompilationSection LoadAssemblyHelper String   assemblyName  Boolean starDirective     613    System Web Configuration CompilationSection LoadAllAssembliesFromAppDomainBinDirectory      203    System Web Configuration CompilationSection LoadAssembly AssemblyInfo   ai   105   System Web Compilation BuildManager GetReferencedAssemblies CompilationSection   compConfig   178   System Web Compilation BuildProvidersCompiler  ctor VirtualPath   configPath  Boolean   supportLocalization  String   outputAssemblyName   54   System Web Compilation ApplicationBuildProvider GetGlobalAsaxBuildResult Boolean   isPrecompiledApp   232   System Web Compilation BuildManager CompileGlobalAsax      52    System Web Compilation BuildManager EnsureTopLevelFilesCompiled      337       HttpException  0x80004005   Could not   load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format     System Web Compilation BuildManager ReportTopLevelCompilationException      58    System Web Compilation BuildManager EnsureTopLevelFilesCompiled      512    System Web Hosting HostingEnvironment Initialize ApplicationManager   appManager  IApplicationHost appHost    IConfigMapPathFactory   configMapPathFactory    HostingEnvironmentParameters   hostingParameters   729       HttpException  0x80004005   Could not   load file or assembly    System Data SQLite  Version 1 0 61 0    Culture neutral    PublicKeyToken db937bc2d44ff139  or   one of its dependencies  An attempt   was made to load a program with an   incorrect format     System Web HttpRuntime FirstRequestInit HttpContext   context   8896783   System Web HttpRuntime EnsureFirstRequestInit HttpContext   context   85   System Web HttpRuntime ProcessRequestInternal HttpWorkerRequest   wr   259

User · Answer

Can you delete your bin debug folder and recompile again?

Or check your project reference to the System.Data.SQLite, track down where it is located, then open the dll in reflector. If you can't open it, that means that the dll is corrupted, you might want to find a correct one or reinstall the .net framework.

User · Answer

I came up with 2 quick solutions  Either work for me  I think the problem is because of permissions   1  Instead of using the Elmah dll file from the net-2 0 directory  I used Elmah dll from net-1 1    2  Instead of keeping Elmah dll in the project bin directory  I make a dll directory to put it in

User · Answer

Manual load related System Data SQLite assembly can resolve this   Changed gatapia s Code as below       public static void LoadSQLLiteAssembly                 Uri dir   new Uri Assembly GetExecutingAssembly   CodeBase           FileInfo fi   new FileInfo dir AbsolutePath           string appropriateFile   Path Combine fi Directory FullName  GetAppropriateSQLLiteAssembly             Assembly LoadFrom appropriateFile              private static string GetAppropriateSQLLiteAssembly                 string pa   Environment GetEnvironmentVariable  PROCESSOR ARCHITECTURE            string arch     String IsNullOrEmpty pa     String Compare pa  0   x86   0  3  true     0     32     64            return  System Data SQLite x    arch     DLL

User · Answer

I have a 64 bit dev machine and 32 bit build server   I used this code prior to NHibernate initialisation   Works a charm on any architecture  well the 2 I have tested   Hope this helps someone   Guido          private static void LoadSQLLiteAssembly                         Uri dir   new Uri Assembly GetExecutingAssembly   CodeBase               FileInfo fi   new FileInfo dir AbsolutePath                          string binFile   fi Directory FullName      System Data SQLite DLL               if   File Exists binFile   File Copy GetAppropriateSQLLiteAssembly    binFile  false                      private static string GetAppropriateSQLLiteAssembly                         string pa   Environment GetEnvironmentVariable  PROCESSOR ARCHITECTURE                string arch     String IsNullOrEmpty pa     String Compare pa  0   x86   0  3  true     0     32     64                return GetLibsDir        NUnit  System Data SQLite x    arch     DLL

User · Answer

Another way to get around this is just to upgrade your application to ELMAH 1 2 rather than 1 1

User · Answer

As someone who s had to deal with quite a few bug reports on Roadkill Wiki with exactly the same issue  this is what you need to do    Are you using x64 or x86  Sqlite comes with DLLs for separate architectures - copy the right one to your bin folder  there are two DLLS for the official provider  System Data SQLite dll System Data SQLite Linq dll If you can t be bothered hunting around for these assemblies  enable 32 bit mode for your App Pool  a solution for dev machines only usually  If you re hosting on a server  you ll need the Microsoft C   Runtime redistributable - it s not installed on Server 2008 R2 by default  x64 version  x86 version   It s a real pain in the ass how many hoops you have to jump through when re-distributing the SQLite  NET binaries  my solution for Roadkill in the end was to copy the correct binaries to the   bin folder based on the architecture your using  Unfortunately that doesn t solve the C   runtime issue

User · Answer

I got this error when our windows server was converted from 32 bit OS to 64 bit   The assembly that was throwing the error was set to compile in x86 mode  ie 32 mode    I switched it to  Any CPU  and that did the trick   You can change this value by doing the following   right click on the project go to Properties - gt  Build - gt  Platform Target - gt  change to  Any CPU

User · Answer

System Data SQLite dll is a mixed assembly  i e  it contains both managed code and native code  Therefore a particular System Data SQLite dll is either x86 or x64  but never both    Update  courtesy J  Pablo Fernandez   Cassini  the development web server used by Visual Studio when you press F5 or click the green   play   button  is x86 only which means that even if your workstation is x64  you ll only be able to use the x86 version of System Data SQLite dll   An alternative is not to use Cassini but IIS7 which is properly x64

User · Answer

I resolved this  oddly enough  by installing System Data SQLite via the Nuget GUI application  as opposed to the package manager console   Installing via the console didn t include the dependencies this library needs to run

User · Answer

Go to the IIS7 Application Pool - gt  advanced settings and set the 32-bit application to true

User · Answer

In our case didn t work because our production server has missing  Microsoft Visual C   2010 SP1 Redistributable Package  x86   We installed it and all work fine  The Application Pool must have Enable 32-bit Applications set to true and you must the x86 version of the library

User · Answer

Make sure that  Enable 32 - Bit Applications  is set to false for the app pool

User · Answer

If you are using IIS Express as the web server on your development machine I would change to Local IIS   This worked for me

User · Answer

I resolved this by installing System Data SQLite with Nuget extension  This extension can use for Visual Studio 2010 or higher  First  you have to install Nuget extension  You can follow here    Go to Visual Studio 2010  Menu --  Tools Select Extension Manager Enter NuGet in the search box and click Online Gallery  Waiting it Retrieve information    Select the retrieved NuGet Package Manager  click Download  Waiting it Download    Click Install on the Visual Studio Extension Installer NuGet Package Manager  Wait for the installation to complete  Click Close and  Restart Now    Second  now  you can install SQLite    Go to the menu TOOLS- Library Package Manager- Package Manager Console of the Visual studio  Then run the command Install-Package System Data SQLite in Package Manager Console  Like this  run the command Install-Package System Data SQLite in Package Manager Console   And now  you can use System Data SQLite    In the case  you see two folder x64 and  x86  these folders contain SQLite Interop dll  Now go to the properties windows of those dlls and set build action is content and Copy to output directory is Copy always   So  that is my way    Thanks  Kim Tho Pham  HoChiMinh City  Vietnam  Email  tho phamkim gmail com

User · Answer

This is very simple if you are not using SQLite   You can delete the SQLite DLLs from your solution s bin folders  then from the folder where you reference ELMAH  Rebuild  and your app won t try to load this DLL that you are not using

User · Answer

You likely have the wrong package installed  You want the package produced by Microsoft which implements the System Data Common provider model

User · Answer

System Data SQLite has a dependency on System Data SQLite interop make sure both packages are the same version and are both x86   This is an old question  but I tried all the above  I was working on a strictly x86 project  so there was not two folders  x86   x64  But for some reason  the System Data SQLite was a different version to System Data SQLite interop  once I pulled down matching dlls the problem was fixed

User · Answer

This is an old post  but it may help some people searching on this error to try setting  Enable 32-Bit Applications  to True for the app pool  That is what resolved the error for me  I came upon this solution by reading some the comments to  beckelmw s answer

[.net] Could not load file or assembly 'System.Data.SQLite'

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