The line found in the User Interface's uc4config.xml file:
<docu type="hh">../../Documentation</docu>
Describes where the Documentation Folder is located. Be sure that the Documentation Folder is in the place stated in the tag above. Also, be sure that the Documentation Folder is on a local drive instead of a shared drive.
The UserInterface folder and the Documentation folder should be parallel to each other as below:
<Please see attached file for image>
align="bottom" border="0" alt=".png" src="http://ecmstage.ca.com/KB%20Asset%20Library/000008587_Embeded/.png">