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Pressures below the lowest physically possible pressure in system at one or more time steps

For the attached model, the start pump elevation is 75m, and the other end elevation of this model is 51M. And even compute the initial condition, there will be the message "Pressures below the lowest physically possible pressure in the system at one or more time steps".

If Start the Transient Solver, there will be the message  "Initial pressure less than vapor pressure. At the pipe end(s), the elevation(s) or head(s) are incorrect." for nearly all of the pipes.

Have placed some Air valves in the model. So, what should we do to next to modify the model? Could you help to review the attached model and provide some suggestions on it?

Thanks a lot

Jinlong