Automation error

Nooby

i am going to make a treeview but im geting an error saying

"this message is for C/AL programmers:

Could not create an instance of the OLE control or Automation server identified by
GUID={EC69A013-CBF8-44B5B149-57B866EBD8D7}1.0:{8C4FFA76-7F2F-49CA-AAEB-FF48414D2C48}:'NavTreeView'.IUserControl.
Check that the OLE control or Automation server is correctly installed and registered"

why do i get the message??

ta5

Possible reasons:
- DLL not installed
- Using the wrong class from the automation server

Hope this helps
Thomas