What are you doing to cause that message to pop up? Are you trying to open a drawing that was created in ADT or LDD? If so, you may need to download and install some object enablers. Check the Autodesk website for the correct enablers:
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2753223&linkID=2475161
Also, make sure to install the 2006 service pack 1:
http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=2475161#sect ion2



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