Document and Issue upload problem

[John]

When I try to upload a document to the documents area in project web access,
I get a dialog box with the following error message:

An unknown error occurred in updating the Project Server database because
Sharepoint objects cannot be saved. Log on to Project Web Access again, and
link the document to a task.

I've tried doing this and get the same error.

However, once I click ok, it refreshes the documents page, and I can view
the document that I just uploaded with no problems. I'm not sure what is
going on.

If it helps, I also get that kind of error when trying to create an issue on
a project.

Any help is appreciated.

Thanks