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Error message in SewerGEMs during validation

I was validating my model in SewerGEMs and recieved the following message for each of the catchments in the model:

"The EPA Runoff calculations failed for this catchment."

 The user's manual does not give any indication to the source of this error. Does anyone have any insight on the source? I should note that it is my intention to use EPA SWMM to calculate runoff.