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Build Errors - 'System.Web.Mvc.ModelClientValidationRule' Conflicts

I am trying to 'build' my MVC3 web app in VS2010 however keep getting the following error:

Error 2 The type 'System.Web.Mvc.ModelClientValidationRule' exists in both 'c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll' and 'c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v2.0\Assemblies\System.Web.WebPages.dll' C:\Users\brownp\Documents\Visual Studio 2010\Projects\Cab\Cab\Models\AccountModels.cs 223 28 Cab

Also, every time I open the solution, it prompts me with the following:

VS2010 error when opening solution

I install via Web Platform Installer and it installs successfully however the message reappears every time I open the solution.

Can anyone offer any guidance?

Thanks Paul

like image 701
Paul Brown Avatar asked Dec 14 '11 21:12

Paul Brown


4 Answers

After installing MVC4 beta today, a few of my MVC 3 projects would not compile. (ModelClientValidationRule conflict) The fix was:

Edit:

ProjectName.csproj

Change

<Reference Include="System.Web.WebPages"/> 

To

<Reference Include="System.Web.WebPages, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL "/>
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Tom Stickel Avatar answered Nov 04 '22 20:11

Tom Stickel


Ok try this solution...

  1. In the root Web.config file, add a new entry with the key webPages:Version and the value 1.0.0.0.

    <appSettings>
    <add key="webpages:Version" value="1.0.0.0"/>
    <add key="webpages:Version" value="1.0.0.0"/>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
    </appSettings>
    

2.In Solution Explorer, right-click the project name and then select Unload Project. Then right-click the name again and select Edit ProjectName.csproj.

3.Locate the following assembly references:

    <Reference Include="System.Web.WebPages"/>
    <Reference Include="System.Web.Helpers" />

Replace them with the following:

<Reference Include="System.Web.WebPages, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL "/>
<Reference Include="System.Web.Helpers, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL "/>

4.Save the changes, close the project (.csproj) file you were editing, and then right-click the project and select Reload.

REFERENCE: http://forums.asp.net/t/1723108.aspx/1

also try: http://www.asp.net/learn/whitepapers/mvc4-release-notes#_Toc303253815

like image 22
bot Avatar answered Nov 04 '22 20:11

bot


Delete System.Web.WebPages from solution references. It is all.

like image 10
Maxim Yefremov Avatar answered Nov 04 '22 21:11

Maxim Yefremov


The best way to avoid this conflict is-

  1. Go to solution explorer
  2. Reference
  3. Right click on System.Web.WebPages
  4. Remove

Now run your application and Enjoy !

like image 3
Rakesh Avatar answered Nov 04 '22 21:11

Rakesh