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HAMMER - engine Calculation Failed

I am modeling a pump station and transfer line with a very high elevation point in the middle of the line in HAMMER. Different pipe sizes are used in the model for the pump station and transfer line (a range of 6" to 24")

In the initial conditions run I get the message of low pressure points in the model.

When I compute the transient it shows the Engine Error Message as attached.

So, I removed the pipeline after the high elevation point and the error of low pressure points and Engine calculation failure are removed.

But How Can I solve the model for water hammer with keeping the whole line?