title: Pycharm - Cannot find declaration to go to
body: <p>I changed my project code from python 2.7 to 3.x. </p>
  
  <p>After these changes i get a message "cannot find declaration to go to" when hover over any method and press ctrl </p>
  
  <p>I'm tryinig update pycharm from 2017.3 to 18.1, remove directory .idea but my issue still exist.</p>
  
  <p>Do you have any idea how can i fix it?</p>