The error message

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This error message shows if the calculated design flow (defined by the end units) does not fit into the defined pump curve.

In the below fictional example, the maximum volume flow are is 0.07 m³/hr. If the calculated design flow is larger than this value, this error pops up.

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It could be the case that this is the true situation, but checks on both the calculated volume flow as well as the filled in pump curve should be done (is the calculated flow to high, or is the pump curve wrongly filled in). A common mistake is filling a pump curve in in m³/hr while needing l/s for example.