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That error code just means the datapoint failed. It could have failed to properly run a measure, or it could have a fatal error in the EnergyPlus simulation. if you see an error for a design alternative you can expand it to see errors for individual workflow steps to identify where the dataoint failed. If you don't see any errors listed for any of the measures, then expand the "EnergyPlus Results" section. It won't show an error like measures do, but if you expand it you can look at the EnergyPlus warnings and errors. You can also open the eplusout.err file if you know where to find the simulation results in PAT's localResults folder.