Failed to load System.Web.Mvc file or assembly or one of its dependencies

Question

currently working on asp.net mvc5 (old mvc3 project). It builds fine, but when I start the project, but when I start the project, I encounter the following error.

Could not load file or assembly 'System.Web.Mvc' or one of its dependencies. The located assembly manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) 

Not sure how I can fix this, any ideas?

This is the assembly load trace:

 === Pre-bind state information === LOG: DisplayName = System.Web.Mvc (Partial) WRN: Partial binding information was supplied for an assembly: WRN: Assembly Name: System.Web.Mvc | Domain ID: 2 WRN: A partial bind occurs when only part of the assembly display name is provided. WRN: This might result in the binder loading an incorrect assembly. WRN: It is recommended to provide a fully specified textual identity for the assembly, WRN: that consists of the simple name, version, culture, and public key token. WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information and common solutions to this issue. LOG: Appbase = file:///C:/Users/joaki/Source/Repos/2015-TimeAdministration/Source/V2/SalesWeb2/TimeReportV2/ LOG: Initial PrivatePath = C:\Users\joaki\Source\Repos\2015-TimeAdministration\Source\V2\SalesWeb2\TimeReportV2\bin Calling assembly : (Unknown). === LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Users\joaki\Source\Repos\2015-TimeAdministration\Source\V2\SalesWeb2\TimeReportV2\web.config LOG: Using host configuration file: C:\Users\joaki\Documents\IISExpress\config\aspnet.config LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///C:/Users/joaki/AppData/Local/Temp/Temporary ASP.NET Files/root/a90c5137/552c494a/System.Web.Mvc.DLL. LOG: Attempting download of new URL file:///C:/Users/joaki/AppData/Local/Temp/Temporary ASP.NET Files/root/a90c5137/552c494a/System.Web.Mvc/System.Web.Mvc.DLL. LOG: Attempting download of new URL file:///C:/Users/joaki/Source/Repos/2015-TimeAdministration/Source/V2/SalesWeb2/TimeReportV2/bin/System.Web.Mvc.DLL. LOG: Using application configuration file: C:\Users\joaki\Source\Repos\2015-TimeAdministration\Source\V2\SalesWeb2\TimeReportV2\web.config LOG: Using host configuration file: C:\Users\joaki\Documents\IISExpress\config\aspnet.config LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Redirect found in application configuration file: 4.0.0.1 redirected to 5.2.3.0. LOG: Post-policy reference: System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 LOG: Attempting download of new URL file:///C:/Users/joaki/AppData/Local/Temp/Temporary ASP.NET Files/root/a90c5137/552c494a/System.Web.Mvc.DLL. LOG: Attempting download of new URL file:///C:/Users/joaki/AppData/Local/Temp/Temporary ASP.NET Files/root/a90c5137/552c494a/System.Web.Mvc/System.Web.Mvc.DLL. LOG: Attempting download of new URL file:///C:/Users/joaki/Source/Repos/2015-TimeAdministration/Source/V2/SalesWeb2/TimeReportV2/bin/System.Web.Mvc.DLL. WRN: Comparing the assembly name resulted in the mismatch: Major Version ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated. 

Web confgg:

  <?xml version="1.0" encoding="utf-8"?> <!-- For more information on how to configure your ASP.NET application, please visit http://go.microsoft.com/fwlink/?LinkId=301880 --> <configuration> <connectionStrings> <add name="SaleswebEntities" connectionString= ""/> </connectionStrings> <appSettings> <add key="webpages:Version" value="3.0.0.0" /> <add key="webpages:Enabled" value="false" /> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings> <system.web> <compilation debug="true" targetFramework="4.5.1" > <assemblies> <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> </assemblies> </compilation> <authentication mode="Forms"> <forms loginUrl="~/Account/LogOn" timeout="2880" /> </authentication> <membership> <providers> <clear /> <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" /> </providers> </membership> <profile> <providers> <clear /> <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" /> </providers> </profile> <roleManager enabled="false"> <providers> <clear /> <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" /> <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" /> </providers> </roleManager> <pages> <namespaces> <add namespace="System.Web.Mvc" /> <add namespace="System.Web.Mvc.Ajax" /> <add namespace="System.Web.Mvc.Html" /> <add namespace="System.Web.Routing" /> <add namespace="System.Web.Helpers" /> <add namespace="System.Web.WebPages" /> </namespaces> </pages> </system.web> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <modules runAllManagedModulesForAllRequests="true" /> </system.webServer> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" /> <bindingRedirect oldVersion="0.0.0.0-7.0.0.0" newVersion="7.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> </dependentAssembly> </assemblyBinding> </runtime> </configuration> 

Answer 1

If you carefully read the fusion magazine that you published, it will provide you with the necessary information. I will parse it to important lines.

 LOG: Attempting download of new URL file:///C:/Users/joaki/Source/Repos/2015-TimeAdministration/Source/V2/SalesWeb2/TimeReportV2/bin/System.Web.Mvc.DLL. 

The application is looking for System.Web.Mvc.dll. He allowed it in the bin folder of your web application: C: \ Users \ joaki \ Source \ Repos \ 2015-TimeAdministration \ Source \ V2 \ SalesWeb2 \ TimeReportV2 \ bin \ System.Web.Mvc.DLL

Then it checks if there is any assembly binding redirection for this dll in your web.config and finds one:

 LOG: Using application configuration file: C:\Users\joaki\Source\Repos\2015-TimeAdministration\Source\V2\SalesWeb2\TimeReportV2\web.config LOG: Redirect found in application configuration file: 4.0.0.1 redirected to 5.2.3.0. LOG: Post-policy reference: System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 

If you look in your web.config, there will be something like this:

  <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> </dependentAssembly> 

Then it checks that the System.Web.Mvc.dll application found in the bin folder is the same version:

 WRN: Comparing the assembly name resulted in the mismatch: Major Version ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated. 

He complains that the main version is not consistent. This is the first number in the version with 4 numbers. If you go back to the log, this is because System.Web.Mvc.dll in the bin folder is actually version 4 .0.0.1 and not the desired 5 . 2.3.0:

 LOG: Redirect found in application configuration file: 4.0.0.1 redirected to 5.2.3.0. 

You need to check your solution to make sure that all projects that reference System.Web.Mvc are looking for the same latest version. If you look at the warnings in the error list, you will most likely find warnings about version mismatches for this assembly.

Link Updates

One solution is to right-click on Solution in Visual Studio, select "Manage NuGet Packages for Solution ..." and try updating projects to use the same version of System.Web.Mvc.

It will also help if you clear bin folders beforehand.

Instead, you can use the package manager console to update the package in your solution:

 Update-Package Microsoft.AspNet.Mvc -version 5.2.3.0 

Answer 2

I am not sure if this will help. But I also had this message:

Failed to load file or assembly "System.Web.Mvc (1)" or one of its dependencies ...

I really don't know why, but when I look at the bin folder in a web application, some of the DLLs have duplicates like "System.Web.Mvc (1) .dll" etc.).

What I did was, I deleted all duplicate files ( file names using "(1)" or "(2)" ... on it) and then rebuild the web application, after which it worked again.

Answer 3

Could you post your web.config file here ?. It seems that you opened the mvc3 project in a newer environment, and the migration function of your IDE (i.e. Visual Studio) is not working properly. The versions of System.Web.Mvc.DLL are incompatible (in the configuration file and in the bin / directory). There are two ways to solve this problem: 1. Change the package / assembly version of System.Web.Mvc in the configuration file. 2. Copy System.Web.Mvc.dll from the old project to the new project (bin / folder).

I used to encounter a similar problem for other DLL files. At that time, I decided to delete all the DLL files and use the NuGet package manager to download them again.