title: Error on Pycharm: ImportError
body: <p>I'm, working on Windows 8 and I receive this error when launching my python program on pycharm:</p>
  
  <pre><code>ImportError: No module named Qwt5
  
      refered to the line: "import PyQt4.Qwt5 as Qwt"
  </code></pre>
  
  <p>the program always worked till today, and the IDE still suggests me Qwt5 as a module to import when pressing <kbd>CTRL</kbd>+<kbd>SPACE</kbd>, so it seems is still recognized.</p>
  
  <p>I checked the Qwt5 folder and there is the <code>__init__.py</code> file</p>
  
  <p>I use Python 2.7.9 an is correctly selected as Python Interpreter</p>
  
  <p>I've already tried to remove the packages and reinstall them.</p>
  
  <p>Someone can help me?</p>