Could not load file or assembly

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ASP.NET

Hi!

I am tring to debug my application, but I always get error 500.
I've checked windows log, and it says:

Exception message: Could not load file or assembly 'System.Web.WebPages.Deployment, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542)

I've tried many things from the web, but they didn't work.

My webconfig:

<configuration>
  <configsections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirepermission="false" />
  </configsections>
    <connectionstrings>
      <add name="xxx" connectionstring="Data Source=xxx;Initial Catalog=HayEvaluation;Integrated Security=True;MultipleActiveResultSets=True" providername="System.Data.SqlClient" />
    </connectionstrings>
  <system.web>
    <sessionstate timeout="4800"></sessionstate>
    <identity impersonate="true">
          userName="xxx" 
          password="xxx" ;
    <authentication mode="Windows";
    <globalization uiculture="hu-HU" culture="hu-HU" />
    <compilation debug="true" targetframework="4.0">
      <assemblies>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
      </assemblies>
    </compilation>
    <pages>
      <controls>
        <add tagprefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
      </controls>
    </pages>
  </identity></system.web>
  <system.webserver>
    <modules runallmanagedmodulesforallrequests="true" />
  </system.webserver>
  <runtime>
    <assemblybinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentassembly>
        <assemblyidentity name="Microsoft.WindowsAzure.Storage" publickeytoken="31bf3856ad364e35" culture="neutral" />
        <bindingredirect oldversion="0.0.0.0-4.0.0.0" newversion="4.0.0.0" />
          <assemblyidentity name="System.Web.WebPages" publickeytoken="31BF3856AD364E35" culture="neutral" />
          <bindingredirect oldversion="0.0.0.0-2.0.0.0" newversion="2.0.0.0" />
      </dependentassembly>
    </assemblybinding>
  </runtime>
</configuration>