title: Source file '' could not be found
body: <p>I have some solution already created I need to work with, but I get these:</p>
  
  <pre><code>Warning 1   At least one file is missing the 'RelPath' attribute.   SolutionName
  
  Error   2   Source file '' could not be found   C:\Users\me\Desktop\someDir\someDir\CSC SolutionName
  </code></pre>
  
  <p>I use VS Express 2013 for Desktop.
  I get this error when I click rebuild solution</p>
  
  <p>Why I get this error and how to fix it?</p>