title: Subversion: Working copy is old development version
body: <p>I'm developing on OSX, and one of my Subversion working copies just started returning the following error for all commands, however my other checkouts work fine. I get the same message with both my Brew installed SVN binaries as well as my Cornerstone client, but other working directories are fine.</p>
  
  <pre><code>&gt; svn update
  svn: E155036: Please see the 'svn upgrade' command
  svn: E155036: Working copy '/working_directory' is an old development version (format 12); to upgrade it, use a format 18 client, then use 'tools/dev/wc-ng/bump-to-19.py', then use the current client
  &gt; svn upgrade
  svn: E155019: Can't upgrade '/working_directory' as it is not a pre-1.7 working copy directory
  svn: E150000: Missing default entry
  </code></pre>
  
  <p>I don't have the <code>bump-to-19.py</code> script anywhere on my computer (according to <code>find / -type f -name bump-to-19.py</code>), however I think I was able to find it on the <a href="http://svn.apache.org/repos/asf/subversion/trunk/tools/dev/wc-ng/bump-to-19.py" rel="noreferrer">Apache repository</a>. That said, I am not familiar with what it does, or how to use it. Ideally I can avoid checking out a new version of this working directory and manually merging in all of my (many) changes.</p>
  
  <p>The only info I was able to find is related to <a href="http://netbeans.org/projects/versioncontrol/pages/Subversion1_7" rel="noreferrer">Netbeans</a> and <code>javahl</code>, and I'm using neither.</p>
  
  <p><strong>EDIT</strong>: After downloading the <code>bump-to-19.py</code> file and making it executable, I tried it against my working directory to no avail:</p>
  
  <pre><code>&gt; ./bump-to-19.py working_directory/
  error: format is 29 not 18: 'working_directory/'
  </code></pre>