Could not load file or assembly or one of its dependencies

Question

Any help please   I have only one library and it is driving me crazy  this is the error that I receive  I am not using any other dependancies   Could not load file or assembly  FOD Intranet Lib  Version 1 0 0 0  Culture neutral  PublicKeyToken 039c1f3a4c719e82  or one of its dependencies  The system cannot find the file specified    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 IO FileNotFoundException  Could not load file or assembly  FOD Intranet Lib  Version 1 0 0 0  Culture neutral  PublicKeyToken 039c1f3a4c719e82  or one of its dependencies  The system cannot find the file specified   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      FileNotFoundException  Could not load file or assembly  FOD Intranet Lib  Version 1 0 0 0  Culture neutral  PublicKeyToken 039c1f3a4c719e82  or one of its dependencies  The system cannot find the file specified      NewCollection VisualWebPart1 VisualWebPart1UserControl TodaysNews    0    NewCollection VisualWebPart1 VisualWebPart1UserControl Page Load Object sender  EventArgs e   52    System Web Util CalliHelper EventArgFunctionCaller IntPtr fp  Object o  Object t  EventArgs e   25    System Web Util CalliEventHandlerDelegateProxy Callback Object sender  EventArgs e   42    System Web UI Control OnLoad EventArgs e   132    System Web UI Control LoadRecursive    66    System Web UI Control AddedControl Control control  Int32 index   350    NewCollection VisualWebPart1 VisualWebPart1 CreateChildControls    155    System Web UI Control EnsureChildControls    146    System Web UI Control PreRenderRecursiveInternal    61    System Web UI Control PreRenderRecursiveInternal    224    System Web UI Control PreRenderRecursiveInternal    224    System Web UI Control PreRenderRecursiveInternal    224    System Web UI Control PreRenderRecursiveInternal    224    System Web UI Control PreRenderRecursiveInternal    224    System Web UI Page ProcessRequestMain Boolean includeStagesBeforeAsyncPoint  Boolean includeStagesAfterAsyncPoint   3394

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In my case  none of the proposed answer worked   Here is what worked for me    Remove the reference Rename the DLL Import the reference again   The second step was important apparently as it did not work without it

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Check the Web config App config file in your project  See if the version numbers are correct    lt bindingRedirect oldVersion  X X X X-X X X X  newVersion  X X X X    gt    This worked for me

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TLDR  the solution for me was to restore default settings in visual studio   I m on visual studio 2019 community edition and I had this issue for same dll file across different projects that I didn t touch  After trying out all the answers in this question  as of 2020-07-22 7 13UTC  I decided to repair visual studio installation  backed up my settings beforehand   After installation opened the solutions that had the problem and the problem was gone  After that imported my settings that and the problem came back   So without repairing visual studio installation again  which takes a few minutes   one restart  I ve simply restored VS default settings and then it works  If I end up having time to investigate  I ll edit the answer and pinpoint the underlaying issue

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Another possible cause  make sure you haven t accidentally given both of the projects the same assembly name in project properties

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At 99  the Could not load file or assembly or one of its dependencies problem is caused by dependencies  I suggest you follow this steps   Download Dependency Walker from http   www dependencywalker com   Launch Dependency Walker and open the dll  in my case NativeInterfaces dll   You can see one or more dll with the error in red Error opening file        It means that this dll is missing in your system  in my case the dll name is MSVCR71 DLL  You can download missings dll from google and copy in right path  in my case c  windows system32   At this point  you must register the new dll in the GAC  Global Assembly Cache   open a DOS terminal and write   cd  Windows System32  regsvr32  i msvcr71 dll   Restart your application

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I  Set as Startup Project  the unloaded unfound library project   Then deployed it   It worked   I think it couldn t found the  dll because it was not in the assembly at first

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I had this problem  the mistake was actually very silly  I had specified the wrong location for the  dll file  after changing the location to correct location the loading happened correctly  answering so someone else don t make this mistake

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Thanks Riddhi M   Following worked for me   Remove Temporary Files C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files Close VSTS and Open Again Remove and Add the same DLLs  Note  you add the same matching versions

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You have to delete Your appname dll file from your output folder  Cleanup Debug and Release folders  Rebuild and copy to output folder regenerated dll file

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A strange fix for me  but I had just pulled this solution from source control   Was getting this error  went through most of the answers above  and then deleted the solution and re-pulled the solution from source control   Worked   Will only apply to a few  but I guess I was one of the few so there will be more  Not sure what happened the first time  but somehow some assemblies must have had some issues when I pulled them across   Essentially turn it off and on again

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Following worked for me    Remove Temporary Files C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files  Close VSTS and Open Again Remove and Add the same DLLs  Note  you add the same matching versions

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Check if you are referencing an assembly which in turn referencing an old version of unity  For example let s say you have an assembly called ServiceLocator dll which needs an old version of Unity assembly  now when you reference the ServiceLocator you should provide it with the old version of Unity  and that makes the problem  May be the output folder where all projects build their assemblies  has an old version of unity    You can use FusLogVw to find out who is loading the old assemblies  just define a path for the log  and run your solution  then check  in FusLogvw  the first line where the Unity assembly is loaded  double click it and see the calling assembly  and here you go

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If you are using the code Page Load  control path       make sure that the actual ascx file you load does not have any directives that include the assembly from your exception message    lt    Register Tagprefix  SharePoint  Namespace  Microsoft SharePoint WebControls  Assembly  Microsoft SharePoint  Version 14 0 0 0  Culture neutral  PublicKeyToken 71e9bce111e9429c    gt

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Following worked for me    Remove Temporary Files C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files  then right click on Temporary Asp net Files properties security and give total control access to IIS and to all user runing my project

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if you are getting this error message by opening an application on you windows xp it mean first you have installed that app due to its not working without net framework 4 and service pack 3   you installed both and again you are getting this error so you should reinstall that app again but first uninstall from add and remove  if this not work please dont abuse me   i am also a junior

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I had the same problem i solved it via the instructions below    open tools menu and select option  in options  window go to Projects and Solutions Web Projects  check use the 64bit version of IIS

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My solution was   I have a three-tier application and I forgot to copy the DLL also to the right path at IIS  Just after copied it to the right place it worked for me

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In my case in the bin folder was a non reference dll called Unity MVC3   i tried to search any reference to this in visual studio without success  so my solution was so easy as delete that dll from the bin folder

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Not sure if this might help   Check that the Assembly name and the Default namespace in the Properies in your asemblies match   This resolved my issue which yielded the same error

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Despite the original question being posted five years ago  the problem still persists and is rather annoying   The general solution is thorough analysis of all referenced assemblies to understand what s going wrong  To make this task easier I made a tool  a Visual Studio extension  which allows selecting a  NET assembly  a  dll or  exe file  to get a graph of all the referenced assemblies while highlighting conflicting or missing references    The tool is available in Visual Studio Gallery  https   marketplace visualstudio com vsgallery 051172f3-4b30-4bbc-8da6-d55f70402734  Example of output

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Assuming that you have access to SharePoint server  try the following  Some random thoughts and no specific order    Deploy the assembly to GAC or copy the dll to the bin folder of your web application Add the assembly info in your web config assemblies section and in the safe controls section   If you are developing a web part  make sure to add its reference in the safe controls section of the web parts  although i don t think this is your problem  Signing the assembly with a strong name might help in some cases   If you have custom dependencies then you need to do the follow the same steps for all the dependencies   other than  net framework and SharePoint related    Are you developing your SharePoint project  do you mean web part   using visual studio  Are you referencing it in your SharePoint project  You need to give us more details on your development environment to be able to pinpoint the problem

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I kept getting this error on my web forms project in visual studio 2015   I shutdown Visual Studio and I killed the ScriptedSandbox64 exe   Microsoft VsHub Server HttpHostx64 exe  Microsoft VsHub Server HttpHostx exe  32  Microsoft VisualStudio Web Host exe  32 processes and it seemed to help fix the issue

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Clean the solution and then right click on the project and select Package  Here increment the Assembly and Assembly file version and rebuild     If that does not work    1 - Open the solution in file Explorer   2 - Close Visual Studio    3 - Remove all bin and obj folders   4 - Reopen the project and build it

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Problem Solved   I thought that Visual Studio was copying the DLL in to the GAC  but apparently not  So I copied it there manually and it works    One question though  is this normal that visual studio does not copy it to the GAC when I deploy the sharepoint application   For those who would like to know how to copy the dll to GAC  there are two ways to copy the dll to GAC    copy the dll manually   Open c  windows assembly directory in windows explorer Open another instance of windows explorer and go to the place where your dll is located   usually in the bin folder   so now you will have two windows open  select the dll you would like to copy to gac and drag it inside the assembly directory  c  windows assembly  use VS to deploy it for you to GAC    in your sharepoint project double click on  Package   Package Package will open  Look bottom left of your screen and click on  Advanced    then click on  Add   then select  Add Assembly from project output       In the Source project dropdownlist select the project and then click OK   finally deploy the solution and the dll will be in the GAC     thank you for your support

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To make Visual Studio adding 3rd party assembly or even your own assembly from other project in solution to GAC please do next    Open Package package from Package folder in SharePoint project  Click Advanced in bottom area  Click Add and chose which type of assembly you want to add  In dialog select dll file  chec GAC or BIN  add safe controls and class resources entries if required  Click Ok    Your assembly will be packaged to WSP  defined in manifest and deployed everytime

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For me rebuilding the unity game without Unity C  Proects Checkmark worked

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I have a C  Winforms project called SetTags with a large number of forms that I use Visual Studio 2013 to work on  After editing one of them and trying to build I got the error   Could not load file or assembly  SetTags Version   2 1 85 0  Culture neutral PublicKeyToken null  or one of its dependencies  The system cannot find the file specified    The error also appeared when I tried to save the project or to close the form I had been working on   I fixed the problem by removing a recently added radio button control and commenting out all references to it  then added the control again and uncommenting the code  This allowed me to save the form  and on closing restarting VS the problem had disappeared   My Visual Studio environment has many occasional problems - Toolbox not showing or appearing only on VS startup  unrecognized custom controls when trying to view a form in Design mode - and it may be that I need to move on to a later VS version

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In solution explorer right click on project  not solution   in build tab choose Platform target    Any CPU

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My solution for  NET 4 0  using Enterprise Library 5  was to add a reference to   Microsoft Practices Unity Interception dll

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I do the following to work out which dependency cannot be found  Run regedit exe and navigate to  HKEY LOCAL MACHINE SOFTWARE Microsoft Fusion  Create the following  LogFailures set value to 1  DWORD  LogResourceBinds set value to 1  DWORD  LogPath  String  set value to C  FusionLog   Now run your program and wait for it to raise Could not load file or assembly or one of its dependencies  Using explorer  navigate to C  FusionLog and there should be a folder containing logs for your program  showing which dependency is missing  Note  Some people use FUSLOGVW exe  which is a viewer for these Fusion Logs  On my machine it can be found in multiple places  including  C  Program Files  x86  Microsoft SDKs Windows v10 0A bin NETFX 4 7 2 Tools x64 FUSLOGVW exe

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Look out for conflicting references  Even after a clean and rebuild  conflicting references will still cause a problem  My problem was between AForge and Accord  I removed both of the references  and re-added the references re-choosing the particular reference  particular to my case  just Accord

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I also got this terrible error and found a solution for this           Right Click on the Solution name   Click Clean Solution   Restart Visual Studio   Goto project Properties    Build   Change Configuration to Release   Start Debugging  F5       1    2     4    5     Hope this will help you also

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Please try to unreference the DLL then re reference it again and rebuild you project  Also Check to ensure that the version matchs what is in the project web config

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For assemblies not in GAC  and which are referred in the build  sometimes this error also happens if the platform target does not match  So match the assembly platform type to the one where it is being used

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Goto  Solution -  Package Click on Advanced Tab   Find below the page  Add your dll to additional assemblies this way we can add external dlls in sharepoint

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For me  none of the other solutions worked  including the clean rebuild strategy   I found another workaround solution which is to close and re-open Visual Studio    I guess this forces Visual Studio to re-load the solution and all the projects  rechecking the dependencies in the process

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Microsoft Enterprise Library  referenced by  NetTiers  was our problem  which was in turn referencing an older version of Unity  In order to solve the problem we used the following binding redirection in the web config    lt configuration gt       lt runtime gt           lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt               lt dependentAssembly gt                   lt assemblyIdentity name  Microsoft Practices Unity  publicKeyToken  31bf3856ad364e35  culture  neutral    gt                   lt bindingRedirect oldVersion  1 0 0 0-2 0 414 0  newVersion  2 1 505 0    gt               lt  dependentAssembly gt               lt dependentAssembly gt                   lt assemblyIdentity name  Microsoft Practices Unity Configuration  publicKeyToken  31bf3856ad364e35  culture  neutral    gt                   lt bindingRedirect oldVersion  1 0 0 0-2 0 414 0  newVersion  2 1 505 0    gt               lt  dependentAssembly gt           lt  assemblyBinding gt       lt  runtime gt   lt  configuration gt    Alternatively  you may want to just update the Enterprise Library to the latest version

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Open IIS Manager  Select Application Pools  then select the pool you are using  go to advanced settings  at right side   Change the flag of Enable 32-bit application false to true

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I wasted a few frustrating hours on this problem too  We had to update our version of the  NET Framework  and started getting multiple    Could not load file or assembly or one of its dependencies    for several DLLs that had not been changed for years  Strangely  the versions being searched for in the error messages were all extremely old  For example  it was searching for Newtonsoft Json version 6 0 0 while we had been using 8 0 1 for years   Reverting to these ancient versions was not an option  and anyway there were a bunch of bindingRedirect elements in our web config file that were supposed to redirect calls to old DLLs to the new ones  Rolling back the  NET version made the errors go away  but we needed the new version  What is going on   The  lt runtime gt  element in our web config file contained the element    lt assemblyBinding appliesTo  v2 0 50727      xmlns  urn schemas-microsoft-com asm v1  gt    The dependentAssembly elements that seemed to be ignored were contained in that   The culprit was the appliesTo attribute  It meant the bindingRedirect applies only to  NET version 2 0 50727  When we updated the  NET Framework version  all our bindingRedirect elements were ignored   The solution in our case was to remove the appliesTo attribute entirely

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For me  it seems that Nuget wasn t playing nice with my project solution  I used Nuget to install NewtonSoft Json   The project file seemed to reference it correctly  and when I R-clicked the dll name in Solution Explorer Dependencies Nuget  then clicked Properties  I found that the dll existed where properties said it should be   I deleted the Nuget package and did R-click Project   Add   Reference and browsed to the dll in a packages directory when a former Nuget process had installed it  and then the Solution ran fine   NOTES   this solution is quite a a hodge podge  starting with a Xamarin iOS solution and adding a  netstandard project  which is where I had difficulty using Nuget    There is also a  portable  project in the solution   I inherited all this from a dev who has been gone for 3 years   Ha ha

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This issue happened to me where one of my dependent libraries was compiling a DLL with  Any CPU  when the parent library was expecting a compilation of  x64

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Your project s csproj file must contain a package reference of Microsoft Practices Unity and this could not be found in the global-packages folder   userprofile  nuget packages   running dotnet restore fixes the issue

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Try checking if the  Copy to Local  property for the reference is set to true and the specific version is set to true  This is relevant for applications in Visual Studio

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You say you have a lot of projects in your solution     well  start with one near the top of the build order  Get that one to build and once you figure it out you can apply the same fix to the rest of them   Honestly  you probably just need to refresh your reference  It sounds like you either updated your version and didn t update the references  or it s a relative path issue if you keep your solution in source control  Just verify your assumptions  and re-add the reference

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Okay this may sound very stupid  but heres how I solved the issue after trying out every other solution and spending a night on this stupid thing    I was getting the same error with some DLL missing from Bin Folder   I tried to delete   get back up everything from Team Foundation Server but didn t work   Got a copy of Bin folder from my office-matelocal machine  and replaced it  It didn t work either   At last  I manually FTPed server  got the copy of DLL which was showing up as missing  and then it started showing up that next file in the file list sequence is missing    So I ftped server Got all Bin Folder  Manually replaced each file one by one   Not Ctrl   All and replace   I tried   it didn t work   And somehow it worked

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for guys still looking into this issue one thing u need to know  is  there are different GACutils out there   so u need  to make sure that ur using correct GACUTIL to deploy the  DLL to correct GAC   for eg  if my dll was complied  in 3 5  net framework  and my OS version was 64 bit windows it would be in below location   C  Program Files  x86  Microsoft SDKs Windows v7 0A Bin x64  Struggled for 4 stupid days to figure this out

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I had this today  and in my case the issue was very odd      lt dependentAssembly gt       lt assemblyIdentity name  Microsoft Owin Host SystemWeb  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-3 1 0  newVersion  3 1 0 0    gt     lt  dependentAssembly gt 0    Note the stray characters at the end of the XML - somehow those had been moved from the version number to the end of this block of XML      lt dependentAssembly gt       lt assemblyIdentity name  Microsoft Owin Host SystemWeb  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-3 1 0 0  newVersion  3 1 0 0    gt     lt  dependentAssembly gt    Changed to the above and voila  Everything worked again

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Juntos answer is correct but you should also consider   For the unity v2 1 505 2 different AssemblyVersion and AssemblyFileVersion attributes are specified     AssemblyFileVersion is used by the NuGet but CLR does not care about it  CLR is going to use only AssemblyVersion   So your redirects should be applied to a version that specified in AssemblyVersion attribute  So 2 1 505 0 should be used   lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt    lt assemblyIdentity name  Microsoft Practices Unity  publicKeyToken  31bf3856ad364e35  culture  neutral    gt   lt bindingRedirect oldVersion  0 0 0 0-2 1 505 0  newVersion  2 1 505 0    gt   lt  dependentAssembly gt   lt  assemblyBinding gt    See also  What are differences between AssemblyVersion  AssemblyFileVersion and AssemblyInformationalVersion

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Step 1  Remove the Existing Reference Step 2  Clean Solution Step 3  Add project Reference again   and its done

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Try to clean Debug and Release folders in your solution  Then remove and add unity again

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Does the version number match  It s weird to see you re trying to load a  lib file instead of a dll  Perhaps you wanted to load a dll instead  To debug this kind of problems  try Fusion Logging You say you re using only one library  but that library might have some dependencies you re not aware of  This SO question deals with listing the dependencies of a managed  NET assembly

[c#] Could not load file or assembly '' or one of its dependencies

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