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Error in pressure drop simulation

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Hi!
I get the following error when trying to simulate the pressure drop in a long pipe with a lot of inlets (se attached model).

Failed to find a solution.
Segregated group 1

Matrix has zero on diagonal for the SSOR update submatrix in the Vanka algorithm.
In segregated group 1:
Returned solution is not converged.

The model has been working before but when i made a few changes it won't run anymore.

Thank you for your help!

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