title: SVN: Cannot mix repository and working copy sources error
body: <p>When I run the following command</p>
  
  <pre><code>svn copy http://host/svn/someproject/trunk \ http://host/svn/someproject/tags/uteeni -m"adding externals"
  </code></pre>
  
  <p>I get a svn:</p>
  
  <pre><code>Cannot mix repository and working copy sources error
  </code></pre>
  
  <p>reply, what am I doing wrong?
  The tags folder has been added to the project and the trunk as well.</p>