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Revit Based HydraCAD (Ribbon/Toolbar/Location)
Description:
Revit could not complete the external command. Autodesk.Revit.Exceptions.ArgumentException
1. Bad info in SprinklerPresets.txt
1. With Revit closed, browse to the HES\Temp folder and delete SpacingPresets.txt
Reopen Revit and try again.