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One day after applying some Windows Updates i got following error:
Could not load file or assembly 'EntityFramework' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

After some hours of google research i found the solution. Somehow the update caused the Visual Studio to change the configuration entries in my web.config to
  <assemblies>
    <add assembly="System.Data.Entity, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    <add assembly="System.Data.Entity.Design, Version=4.1.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
  </assemblies>


In the compilation output was following line visible:
"Could not load file or assembly 'EntityFramework, Version=4.1.0.0"

The Solution - simply switch the EntityFramework version back to:
  <assemblies>
    <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
    <add assembly="System.Data.Entity.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
  </assemblies>