Problem with mailmerge document

Asalam-o-Alaikum:

I have created a mailmerge document using c#,it works fine when i run it on a seperate project but when i try to run it on VSS(Visual Source Safe)it gives me this error:

“Creating an instance of the COM component with CLSID {00020906-0000-0000-C000-000000000046} from the IClassFactory failed due to the following error: 8001010a.”

after compiling this line

“Word.Document oWordDoc = new Word.Document();”

can anybody know whats going on.

thanx