title: Reference required to assembly System.Runtime
body: <p>I am integrating google drive api in my .net application. It works fine with when i created new project in Visual Studio 2012.
  But I am facing with issues when i am trying to integrate it with already developed application. The error is :</p>
  
  <blockquote>
    <p>Compiler Error Message: BC30007: Reference required to assembly
    'System.Runtime, Version=4.0.0.0, Culture=neutral,
    PublicKeyToken=b03f5f7f11d50a3a' containing the base class
    'System.Object'. Add one to your project.</p>
  </blockquote>
  
  <p>I have included dlls in my bin folder. I can see visual studio is picking up namespaces for included dlls.</p>
  
  <p>I need to know what exactly this error message means and how to fix it.</p>
  
  <p>Thanking you in advance.</p>