title: Eclipse says: “Workspace in use or cannot be created, chose a different one.” How do I unlock a workspace?
body: <p>When I start, Eclipse says "Workspace Cannot Be Locked"</p>
  
  <p>"Could not launch the product because the associated workspace is currently in use by another Eclipse application." or “Workspace in use or cannot be created, chose a different one.”</p>
  
  <p>But I know it isn't.</p>
  
  <p>How do I "unlock" it?</p>