I was trying to process basin slope using HEC-GeoHMS tool, and I received this error "background processing has encoutered a serious error and is unable to continue" Please help

[ThaboBafitlhile]

I was trying to process basin slope using HEC-GeoHMS tool, and I received this error "background processing has encoutered a serious error and is unable to continue" Please help.

[NeilAyres]

Much more detail required here...

Data, tool inputs, context, what were you doing etc etc.