title: Type or namespace name does not exist
body: <p>I am using the code below :</p>
  
  <pre><code>using CMS.DataEngine;
  using CMS.DocumentEngine;
  
  namespace Fort.CMS.CMSPages
  {
      public partial class CreatePage : System.Web.UI.Page
      {
          #region "Variables"
  
          private CMS.DocumentEngine.TreeNode mNode;
          private TreeProvider mTree;
  </code></pre>
  
  <p>Getting error at the line: private CMS.DocumentEngine.TreeNode mNode;</p>
  
  <blockquote>
    <p>Error :</p>
    
    <p>Type or namespace name "DocumentEngine" does not exist in the
    namespace "Fort.CMS"</p>
  </blockquote>
  
  <p>Here DocumentEngine is not recognized.</p>
  
  <p>But it works if we remove the namespace.</p>
  
  <pre><code>namespace Fort.CMS.CMSPages
  {}
  </code></pre>