title: Eclipse Open declaration in Java project
body: <p>In an Eclipse SVN project I have a problem; when I tried to open a declaration of one class, I got this error: </p>
  
  <pre><code>Problems opening an editor Reason : projectname does not exist.
  </code></pre>
  
  <p>Also refactoring does not work.</p>
  
  <p>I have searched the web and tried all found solutions but nothing helped.
  I have downloaded different Eclipse and Java versions and switched to a clean workspace but I still have the problem.</p>
  
  <p>How can I solve my problem or which solution can I try?</p>