title: Undoing a commit in Tortoisesvn
body: <p>I did a search it said to view the log, right click the revision I want to go back to and select revert to this revision but I always get this error:</p>
  
  <blockquote>
    <p>Cannot reverse-merge a range from a
    path's own future history; try
    updating first</p>
  </blockquote>