title: Updating ToolsVersion="12.0" in Visual Studio 2012
body: <p>I am trying to compile a project written in C++. The compiler gave me this error.</p>
  
  <pre><code>1&gt;Project file contains ToolsVersion="12.0". This toolset is unknown or missing. You may be able to resolve this by installing the appropriate .NET Framework for this toolset. Treating the project as if it had ToolsVersion="4.0".
  </code></pre>
  
  <p>Can someone tell me How to resolve this error. I tried to update it but was unable to do so?</p>