title: Unknown build error
body: <p>I followed <a href="http://www.codeproject.com/Articles/23731/RecentFileList-a-WPF-MRU" rel="nofollow">this</a> link to make use of "recent files list" but statement below causes build error. BTW, I referenced dll file. <code>xmlns:common="clr-namespace:Common"</code> works good but when I add the rest it does not work.</p>
  
  <pre><code>xmlns:common="clr-namespace:Common; assembly=RecentFileListLib"
  </code></pre>
  
  <p>Error message:</p>
  
  <p><code>Error  1   Unknown build error, ''clr-namespace:Common; assembly=RecentFileListLib' mapping URI is not valid. Line 4 Position 9.'</code></p>