PySP command result related to output: ** At least one sub-... failed to solve! **

Question

![The screenshot is from the error result of command:

runph --model-directory=models --instance-directory=scenariodata --solver=ipopt --default-rho=1

]1

Although I could still get outputs, I wonder what does this error warning

"** At least one sub-problem failed to solve! **"

mean? and what should I do next? Thanks for your kind help.

Answer 1

In this case, there is a problem with the constraint, or the value of the objective function goes to infinity.

I recommend to add '--verbose' in your command. This command can help you why this error is occurred.

runph --model-directory=models --instance-directory=scenariodata --solver=ipopt --default-rho=1 --verbose

This command provides more information about your problem.