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Error: Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed

Good Afternoon:

I am trying to model an irrigation net with a pump, reservoir an irrigation net where all are connected.

My particular situation to model is:

  • No demand in any hydrant
  • Pump working from the river to the reservoir
  • Pump shot down after time delay to study the trasnsient.

In the irrigation net I have several PRV working and when I compute the system I get the following error on PRVs valves. "Initial flow is zero, which would result in a discharge coefficient equal to 0, which is not allowed." 

How can I solve it without demand?

thank you very much for you help.

Kids regards.