Could not load file or assembly ‘System.Web.WebPages.Razor, Version=2.0.0.0

asp.net-4.0asp.net-mvc-3dependenciesrazor

I just upgraded packages in an MVC 3 project (ASP.net 4), and now I am getting the following error message when accessing a page in that project:

Server Error in '/MyApplication' Application.

Could not load file or assembly 'System.Web.WebPages.Razor,
Version=2.0.0.0, 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.WebPages.Razor, Version=2.0.0.0, 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:

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.

Assembly Load Trace: The following information can be helpful to
determine why the assembly 'System.Web.WebPages.Razor,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
could not be loaded.

=== Pre-bind state information === LOG: User = IIS APPPOOL\ASP.NET v4.0 LOG: DisplayName = System.Web.WebPages.Razor, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35 (Fully-specified)
LOG: Appbase = file:///C:/…/ LOG: Initial PrivatePath = C:…\bin
Calling assembly : Microsoft.Web.Helpers, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35.
=== LOG: This bind starts in default load context. LOG: Using application configuration file: C:…\web.config LOG: Using host
configuration file:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet.config LOG:
Using machine configuration file from
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.
LOG: Post-policy reference: System.Web.WebPages.Razor,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 LOG:
Attempting download of new URL
file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary
ASP.NET Files/…/cb62a7b2/327a0353/System.Web.WebPages.Razor.DLL.
LOG: Attempting download of new URL
file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary
ASP.NET
Files/…/cb62a7b2/327a0353/System.Web.WebPages.Razor/System.Web.WebPages.Razor.DLL.
LOG: Attempting download of new URL
file:///C:/LeGroupeHtmSVN/…/UpDir.Web/bin/System.Web.WebPages.Razor.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.WebPages.Razor, Version=2.0.0.0, 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)]
Microsoft.Web.Helpers.PreApplicationStartCode.Start() +0

[InvalidOperationException: The pre-application start initialization
method Start on type Microsoft.Web.Helpers.PreApplicationStartCode
threw an exception with the following error message: Could not load
file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0,
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.Compilation.BuildManager.InvokePreStartInitMethods(ICollection`1
methods) +11711966
System.Web.Compilation.BuildManager.CallPreStartInitMethods() +465
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager
appManager, IApplicationHost appHost, IConfigMapPathFactory
configMapPathFactory, HostingEnvironmentParameters hostingParameters,
PolicyLevel policyLevel, Exception appDomainCreationException) +1167

[HttpException (0x80004005): The pre-application start initialization
method Start on type Microsoft.Web.Helpers.PreApplicationStartCode
threw an exception with the following error message: Could not load
file or assembly 'System.Web.WebPages.Razor, Version=2.0.0.0,
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) +11700896
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)
+141 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest
wr, HttpContext context) +4869125

——————————————————————————– Version Information: Microsoft .NET Framework Version:4.0.30319;
ASP.NET Version:4.0.30319.272

In my web.config file, and in my application, I am referencing System.Web.WebPages.Razor v1.0.0.0:

  <dependentAssembly>
    <assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-1.0.0.0" newVersion="1.0.0.0" />
  </dependentAssembly>

I don't even know whether I could be using System.Web.WebPages.Razor v2.0.0.0 with .Net 4.

Now, how do I find out what is referencing System.Web.WebPages.Razor v2.0.0.0?

Best Answer

So simple. In Nuget Package Manager Console:

Update-Package Microsoft.AspNet.Mvc -Reinstall

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