Error message when trying to open Plan via Project Center

[Manal]

Hello,

I seem to be having the following issue:

If i go to PWA, Access my Project Center and select my project the plan is
then displayed for it, which is great. It is when i select 'edit' and project
professional opens up that I get the error message below. Neither of the
reasons given are applicable. I did notice however that after pressing ok,
and then going to the file menu, selecting open, I cannot see any of my
projects under 'Enterprise Projects', and therefore I assume neither can
project prof see them.

If I close up project professional and then open it up again myself I am
able to see them. Any help on what I may be missing would be appreciated,

ERROR MESSAGE:
"Project Server was unable to find the specified project.
The project was not found on Project Server. Some possible reasons include:
- The project has not yet been saved successfully to the server.
- The project has been deleted on the server.
If the project is available in the Local Project Cache, you can choose the
File menu, select 'Work Offline' and then open the project. If the problem
continues, contact your server administrator".


Thanks
Manal