Could not load file or assembly System Web Http 4 0 0 after update from 2012 to 2013

Question

I did the upgrade according to   http   www asp net mvc tutorials mvc-5 how-to-upgrade-an-aspnet-mvc-4-and-web-api-project-to-aspnet-mvc-5-and-web-api-2  I get the error  Does any one else got this error      Server Error in     Application       Could not load file or assembly  System Web Http  Version 4 0 0 0    Culture neutral  PublicKeyToken 31bf3856ad364e35  or one of its   dependencies  The located assembly s manifest definition does not   match the assembly reference   Exception from HRESULT  0x80131040    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 FileLoadException  Could not load file   or assembly  System Web Http  Version 4 0 0 0  Culture neutral    PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   located assembly s manifest definition does not match the assembly   reference   Exception from HRESULT  0x80131040       Source Error        Line 48               Line 49               Line 50            Line   51   Line 52          protected void Application BeginRequest object   sender  EventArgs e       Source File     d  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI Global asax cs    Line     50       Assembly Load Trace  The following information can be helpful to   determine why the assembly  System Web Http  Version 4 0 0 0    Culture neutral  PublicKeyToken 31bf3856ad364e35  could not be loaded           Pre-bind state information     LOG  DisplayName   System Web Http  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35     Fully-specified  LOG  Appbase     file    D  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI  LOG  Initial   PrivatePath   D  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI bin   Calling assembly   ThirdPartyWebAPI  Version 1 0 0 0  Culture neutral    PublicKeyToken null        LOG  This bind starts in default load context  LOG  Using application configuration file    D  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI web config LOG  Using   host configuration file    C  Users michalc Documents IISExpress config aspnet config LOG  Using   machine configuration file from   C  Windows Microsoft NET Framework v4 0 30319 config machine config    LOG  Post-policy reference  System Web Http  Version 4 0 0 0    Culture neutral  PublicKeyToken 31bf3856ad364e35 LOG  Attempting   download of new URL   file    C  Windows Microsoft NET Framework v4 0 30319 Temporary   ASP NET Files root 9184b2ea c6d4b139 System Web Http DLL  LOG    Attempting download of new URL   file    C  Windows Microsoft NET Framework v4 0 30319 Temporary   ASP NET   Files root 9184b2ea c6d4b139 System Web Http System Web Http DLL  LOG    Attempting download of new URL   file    D  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI bin System Web Http DLL    WRN  Comparing the assembly name resulted in the mismatch  Major   Version ERR  Failed to complete setup of assembly  hr   0x80131040     Probing terminated       Stack Trace         FileLoadException  Could not load file or assembly  System Web Http    Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  or   one of its dependencies  The located assembly s manifest definition   does not match the assembly reference   Exception from HRESULT    0x80131040      ThirdPartyWebAPI WebApiApplication Application Start     in d  SM 7 4Test WebAPIServerV2 ThirdPartyWebAPI Global asax cs 50       HttpException  0x80004005   Could not load file or assembly    System Web Http  Version 4 0 0 0  Culture neutral    PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   located assembly s manifest definition does not match the assembly   reference   Exception from HRESULT  0x80131040     System Web HttpApplicationFactory EnsureAppStartCalledForIntegratedMode HttpContext   context  HttpApplication app   9935033   System Web HttpApplication RegisterEventSubscriptionsWithIIS IntPtr   appContext  HttpContext context  MethodInfo   handlers   118   System Web HttpApplication InitSpecial HttpApplicationState state    MethodInfo   handlers  IntPtr appContext  HttpContext context   172   System Web HttpApplicationFactory GetSpecialApplicationInstance IntPtr   appContext  HttpContext context   336   System Web Hosting PipelineRuntime InitializeApplication IntPtr   appContext   296       HttpException  0x80004005   Could not load file or assembly    System Web Http  Version 4 0 0 0  Culture neutral    PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   located assembly s manifest definition does not match the assembly   reference   Exception from HRESULT  0x80131040     System Web HttpRuntime FirstRequestInit HttpContext context   9913572    System Web HttpRuntime EnsureFirstRequestInit HttpContext context     101    System Web HttpRuntime ProcessRequestNotificationPrivate IIS7WorkerRequest   wr  HttpContext context   254     Version Information  Microsoft  NET Framework Version 4 0 30319  ASP NET Version 4 0 30319 18408

User · Answer

When I installed Web Api 2 2 help this error started   I added this to the web config and it solved my problem      lt dependentAssembly gt       lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 2 2 0  newVersion  5 2 2 0    gt     lt  dependentAssembly gt

User · Answer

Or you could do this from NuGet Package Manager Console   Install-Package Microsoft AspNet WebApi -Version 5 0 0   And then you will be able to add the reference to System Web Http WebHost 5 0

User · Answer

I could solve similar problem with System Net HTTP by adding assembly reference in app config of main application      lt runtime gt       lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt         lt dependentAssembly gt           lt assemblyIdentity name  System Net Http  publicKeyToken  b03f5f7f11d50a3a  culture  neutral    gt           lt bindingRedirect oldVersion  0 0 0 0-4 1 1 1  newVersion  4 0 0 0    gt         lt  dependentAssembly gt  lt  runtime gt

User · Answer

I had the same problem with System Web Http WebHost  Version 5 2 6 0 being referenced but the latest NuGet package was 5 2 7 0   I edited the web config files  re-installed the NuGet package  then edited the visual studio project files for all of my projects to make sure no references to 5 2 6 0 persisted   Even after all this  the problem persisted   Then I looked in the bin folder for the project that was throwing the exception  where I found a DLL for one of my other projects that is not a dependency and should never have been there   I deleted the offending DLL  which had been compiled using the 5 2 6 0 version of System Web Http WebHost   rebuilt the troublesome project  and now it is working

User · Answer

To resolve the Could not load file or assembly  System Web Http  error use NuGet to install the Web API 2 1 WebHost   In solution explorer in the references right click and select manage nuget packages   if not there install nuget     In the manage NuGet Packages window on the left side click online then in top right search for Web Host and install Microsoft ASP NET Web API 2 1 Web Host   Once installed the install button will change to a green check   After that the project will reload and when it s build again the error will be resolved and the project will debug and run  The error will be gone and you may be  The resource cannot be found  Just append the url   ex from  localhost 52088  to localhost 52088api products    Your question was good and helped me   Hope this answer helps

User · Answer

If you use several projects on a solution  and call method in one project to another project  make sure that all projects  called project and caller project  use the unique  System Net Http  version

User · Answer

Change the Specfic version flag from true to false for the dll in the reference

User · Answer

This might help someone   I decided to go with MVC4 app    run project  worked  Then Installed few packages like  Microsoft ASP NET WEB API 2 2  4 packages    Microsoft ASP NET WEB API 2 2 Help Page Microsoft ASP NET WEB API 2 2 OWIN  run project  same error as mentioned in question  Solution   In web config    lt dependentAssembly gt         lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt         lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 2 3 0    gt         lt  dependentAssembly gt         lt dependentAssembly gt           lt assemblyIdentity name  System Net Http Formatting  publicKeyToken  31bf3856ad364e35  culture  neutral    gt           lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 2 3 0    gt    lt  dependentAssembly gt     Problem Solved    but then  some hotfix error found  To resolve it  go to VIEW folder of your MVC4 project  find second web config file and changed version from 2 0 0 0 to 3 0 0 0 as shown below       lt configSections gt       lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt         lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt         lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt       lt  sectionGroup gt     lt  configSections gt

User · Answer

As others have said just reinstall the MVC package to your web project using nuget  but be sure to add the MVC package to any projects depending on the web project  such as unit tests   If you build each included project individually  you will see witch ones require the update

User · Answer

I got this issue when deploying to Azure using the Publish feature  Remember to clear files at destination   Publish Settings - gt  File Publish Options drop down - gt  Check Remove additional files at destination  This solved my issue  in case people have to hunt around for this like I did  Everything was the same version in my project solution  just not at the destination I was deploying to

User · Answer

I found that Deleting the BIN folder and then rebuilding the project fixed the issue without having to uninstall reinstall packages

User · Answer

I solved this problem by reverting the changes that nuget had made to my web config after running nuget  Revert the changes to a previous working version      lt dependentAssembly gt       lt assemblyIdentity name  System Web Mvc  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 2 2 0  newVersion  5 2 2 0    gt     lt  dependentAssembly gt

User · Answer

Me did not nothing  just copied development Bin folder DLLs to online deployed Bin folder and it worked fine for me

User · Answer

Installing NuGet package ASP NET MVC solved the issue for me    To install package   - Right click on project   - Select  Manage NuGet Packages   - Select Online- gt Nuget org from left menu  - select  Microsoft ASP NET MVC   - Click Install   If you have already installed package earlier  please update the package by selecting Updates from left menu and then selecting  Microsoft ASP NET  and click Update

User · Answer

I found the solution   Delete folder named package in project directory and then rebuild to run it

User · Answer

ASP NET Version 4 0 30319 18408 belongs to  Net4 5 and System Web Http Version 4 0 0 0 is compatible for  NET4 0  So the versions that you have are not compatible  You should update you System Web Http to version 5 0 0 0  which is compatible with  Net4 5

User · Answer

I had this from a WCF service  For me  as the issue was displaying in local dev   I simply had to delete the contents of the bin folder under the solution   The the rebuild work fine once again

User · Answer

I had same problem and reinstalling package doesn t work   My application runs in LocalIIS not IIS EXPRESS    I enable Assembly Load Trace and find out it want load System Web Http load from below temp catche  so remove all catch folders in it   C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files my application

User · Answer

What solved the problem for me was re-installing the Microsoft ASP NET Web API 2 2 Help Page and Microsoft ASP NET Web API 2 2 OWIN packages  I re-installed both at the same time  but I think it was the former that fixed the issue   I tried the first few of the solutions offered here but that didn t help  then I compared my dependencies with the ones in a project that worked  from a course on Pluralsight  and the two dependencies above were a lower version  5 0 0  so I updated them to 5 2 3 and it started working

User · Answer

lt dependentAssembly gt       lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt   lt dependentAssembly gt       lt assemblyIdentity name  System Net Http Formatting  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 0 0 0  newVersion  5 0 0 0    gt   lt  dependentAssembly gt

User · Answer

The proper solution to resolve this issue is by following the steps    Update Visual studio if you have older version to 15 5 4  Optional    Remove all binding redirects from web config Add this to the csproj file       lt PropertyGroup gt     lt AutoGenerateBindingRedirects gt true lt  AutoGenerateBindingRedirects gt     lt GenerateBindingRedirectsOutputType gt true lt  GenerateBindingRedirectsOutputType gt   lt  PropertyGroup gt      Build  In the bin folder  there should be a  WebAppName  dll config file  It should have redirects in it  Copy these to the web config Remove the above snipped from the csproj file again It should work   Detailed Blog

User · Answer

I had a similar issue  Everything was working before  It s was originally made using Web Forms and later on added Web API for some things    Tried uninstalling  installing and reinstalling Microsoft AspNet WebApi package  Tried removing packages folder from solution and letting NuGet restore in VS  Tried removing individual assembly references  under References  and reinstalling packages  Tried adding binding redirects to 5 2 3 0 version in web config mentioned in several answers  Nothing worked for me    What worked was  in Visual Studio  change publish profile settings from Release to Debug  Strange  but that s what worked  So sharing here

User · Answer

YES     Install-Package Microsoft AspNet WebApi -Version 5 0 0   It works fine in my case    thnkz

User · Answer

I simply set Copy Local   true on the missing assembly and that worked  This of course happens by right clicking on the missing reference  which is stated in the error message  and selecting properties  as below     This should then solve one problem as there might be more than one assembly causing the issue - what I did is I selected all assemblies and right click on them  selected properties  and set them all to Copy Local   true  and then republish

User · Answer

I fixed this by reinstalling the NuGet package  which corrects broken dependencies  From the package manager  run   Update-Package Microsoft AspNet WebApi -reinstall

User · Answer

Just an obvious but possible helpful hint    remember to check that the new version you specify in your webconfig assembly binding is the same version that you reference in your project references   ie as I write this   this would be 5 1 0 0 if you have recently done a NUGet on System Web Http

User · Answer

You need to add assembly redirects    lt configuration gt                lt runtime gt         lt assemblyBinding gt       lt dependentAssembly gt           lt assemblyIdentity name  System Web Http  publicKeyToken  31bf3856ad364e35  culture  neutral    gt           lt bindingRedirect oldVersion  0 0 0 0-4 5 0 0  newVersion  5 0 0 0    gt         lt  dependentAssembly gt         lt  assemblyBinding gt      lt  runtime gt            lt  configuration gt    Most likely you have to do this for a few more assemblies like webhosting  etc

User · Answer

In my case  I was actually missing my web config altogether  which had the appropriate binding redirects   Restoring the web config resolved the error

User · Answer

For me it was only crashing with this error on a production environment  not on local machine  what solved it was to delete the content of  bin folder and then to regenerate it again

[c#] Could not load file or assembly 'System.Web.Http 4.0.0 after update from 2012 to 2013

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