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What does the following user notification mean and how can it be resolved?
"There is an error in the data for this pipe. The associated data is incorrect"
One reason this could occur would be if the flow or headloss in this pipe is very low in the initial conditions. Basically the transient calculation engine is less forgiving in terms of the accuracy of the initial condition values. Even more so with small flows and very small friction head loss. Friction factor calculation with these very small numbers could result in very inaccurate values and the program may not be able to converge on a solution.
Try the following steps to resolve the issue.
Go to Analysis > Calculation Options. Under "Steady State/EPS Solver," double-click the active calculation option to view the properties. In the Properties, make the "Accuracy" value smaller, such as changing the value from 0.001 to 0.00001. Then, compute initial conditions and try computing the transient simulation.