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modeling a pump start-up transient event in hammer (need help)

I have an in-line pumping system and I wanted to simulate the pump start-up , I set the problem as in the various examples present in the comunity, but the result of the analysis is "wave speed must be greater than zero".
What could be the problem? thank you for the answer.

S.Nicolaprogettoaccensionepompe.wtg