Unable to open a ongoin project from Project

T

TP

Hello
We use Project Server 2003 SP2.
One of our project suddently could not be opened: we get the error message
"your project servers's tracking setting was changed since you last saved
this project.. ". -- We have not changed any settings.
- It happens only with 1 project

What is the root cause?
Any idea to fix this issue other than restoring the project?

Many thanks
 
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