title: I can't debug, mscorlib.dll error
body: <p>  When i start my project (in Debug or Release, Visual Studio 2015), I get this error:
  </p>
  
  <p><a href="https://i.stack.imgur.com/wMHIn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wMHIn.png" alt="Error on start project "></a></p>
  
  <p>
    I tried to repair my .NET framework, but I got no success, I cant debug this error because it isn't code error.
  </p>
  
  <p>Which can cause it?</p>
  
  <p><br>
  How can I repair it?</p>
  
  <p><br>
  How to prevent this?</p>