Can you please be more specific. Post your specific query community will try to help.What are your Inputs, variables, constraints etc
However if you are trying to work on the Anaplan provided Network optimization exercise here is the file that might help. If you are still not getting the output then I would narrow down my efforts on this screen esp on Variable Range - min and max
It depends what you are trying to achieve. When you are sure that you have built the optimizer correctly and you still don't get the result it can mean that optimizer has come up with multiple answers but since you haven't set the ranges it doesn't throw any output. Generally I keep min limit as zero but that might not be true for all cases.