title: Can't save project preferences in Eclipse
body: <p>All I am trying to do is to set the Java compiler for my project as 5.0. It is 1.4 by default. When I try to save by pressing OK button I get the following error.</p>
  
  <p>Preferences Save Failed:</p>
  
  <p>Reason:
  Exception Occured while saving project preferences:
  /com.myproj.reqmanager.ui/.settings/org.eclipse.jdt.ui.prefs.</p>
  
  <p>I never got this error earlier. I mean I have imported this project before and saved preference settings without any problem. Out of nowhere I am getting this problem now.</p>