Error registering this project on Microsoft Project server

[Ania]

Hi everybody,

I have been using project server and professional for a
long time and all of a sudden when I try to create a new
project using MS project Professional I get the error,

"There was Error registering this project on Microsoft
Project server".

But it actually saves it on the project server and
everything seems fine, I just dont understand why I get
that error.
Has any body seen this before?

Any help would be greatly appreciated.
Ania