title: Unable to attach to application ... The format of the PE module is invalid
body: <p>Im trying to debug a silverlight app inside it's web project.</p>
  
  <p>Any time I run the debugger I receive the message:</p>
  
  <pre><code>Unable to attach to application 'WebDev.WebServer40.EXE' (PID: 8412) using '[PC-NAME]'.  The format of the PE module is invalid.
  </code></pre>
  
  <p>Edit: I've tried removing the SUO files, clean and build - nothing will make this error go away, and googling the phrase "the format of the PE module only pulls up THIS question...</p>