Configuration error while using Areas in ASP.NET MVC 4

asp.netasp.net-mvc-4

After upgrading to ASP.NET MVC 4, application is breaking on accessing any webpage defined inside an Area

Error screen shot

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: An error occurred creating the configuration section handler for system.web.webPages.razor/host: The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

<section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=__WebPagesVersion__.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />

Best Answer

Added this as an answer from comment:

Change Version=_WebPagesVersion_.0.0 to Version=2.0.0.0

Alternatively see if you have any other web.config files floating about in your project and see what values are used there - I understand that sometimes if you have multiple web.config referencing different version of the hosts section it can get quite upset. BTW there is no need to uninstall MVC 3 before 4 - they co-exist happily!

Related Solutions

Error Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35

It appears that Microsoft.Web.Infrastructure.dll is not being installed in the GAC, even if .net (4.0 or 4.5 or other) are installed successfully on Windows Server. On localhost (typically Windows client), it seems like it is being in the GAC when the tools/platform (Visual Studio etc.) are installed.

As one possible fix, please try the following:

Run the following command in the Package Manager Console. (If you are using Visual Studio, this can be reached via menu options "Tools --> Library Package Manager --> Package Manager Console:)
```
PM> Install-Package Microsoft.Web.Infrastructure
```
You will see the following messages if it is successfully installed.
```
Successfully installed 'Microsoft.Web.Infrastructure 1.0.0.0'.
Successfully added 'Microsoft.Web.Infrastructure 1.0.0.0' to Web.
```
You will notice that Microsoft.Web.Infrastructure.dll has now been added as a Reference (can be seen in the references folder of your project in in Solution Explorer)
If you look at the properties of this reference you will notice that "Copy Local" has been set to "True" by default.
Now when you "Publish " your project, Microsoft.Web.Infrastructure.dll will be deployed.

Upgrading WebGrease to version 1.3.0 gets me error

Here is the answer that has worked for me, and it is a combination of some of the above answers. First install / uninstall / reinstall the following packages:

Install-Package Microsoft.AspNet.Web.Optimization 
Update-Package WebGrease
Uninstall-Package Microsoft.AspNet.Web.Optimization
Uninstall-Package WebGrease
Install-Package Microsoft.AspNet.Web.Optimization 
Update-Package WebGrease

Then make a copy of the contents of ~/Views/Shared/_Layout.cshtml delete the _Layout.cshtml file, recreate it and paste the contents back in.

this is the final fix that has worked for me.

Best Answer

Related Solutions

Error Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35

Upgrading WebGrease to version 1.3.0 gets me error

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