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I copied a project to another computer and I have this error.

Could not load file or assembly 'System.Web.Helpers, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Screenshot of error is in this part.

        <add assembly="System.Web.Abstractions, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Data.Linq, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
        <add assembly="System.Web.Helpers, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Routing, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.Mvc, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Web.WebPages, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Data.Entity, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
Posted 24-Apr-13 5:35am
richcb 24-Apr-13 11:38am
It means you are missing a reference in your project. Try to add the assembly it is referring to.
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Solution 3

That assambly is part of MVC4. So either install MVC4[^], or this one:[^].
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Solution 1

I cannot find that System.Web.Helpers.dll on my machine - it is likely not part of the .Net Framework 4. When you deploy your application on a different computer, you have to deploy that dll also (check its license, in case it is not your own product!).
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Solution 2

right click on project in solution exploret.
select Add diployable dependencies
checked MVC and click ok

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