When running a fire flow analysis or validating a model, the following error message is generated:
"Object reference not set to an instance of an object."
The error message in question is generic and could have another cause. However, this can occur when WaterGEMS or WaterCAD V8i SELECTseries 6 is installed on a Windows XP operating system.
While WaterGEMS and WaterCAD V8i SELECTseries 6 (or later) may install on a Windows XP operating system, it was never tested and is not supported on Windows XP. Microsoft has stopped supporting Windows XP and key components used by WaterGEMS and WaterCAD will no longer work as expected.
If you install the product on a modern operating system, the issue will is likely to be resolved.
Error opening model with DXF background layer applied: A procedure imported by 'Haestad.RealDWG.Interop" could not be loaded.