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When importing a WaterCAD V7 database file into WaterCAD or WaterGEMS V8i, the following error message is generated:
"Object reference not set to an instance of an object"
or
"The path provided is not a WaterCAD V7 file"
This can occur if the database associated with the old model file has become corrupted. If you have a backup file or an older version of the model file, try to open this instead. For the backup file, these steps can be used to restore the backup file to allow you to import the file.
If these will not import either, try to open the WaterCAD V7 database file in Microsoft Access. If the file opens, try to compact the database. If the file will not open in Access, the file is corrupted and cannot be used. You can try to recreate the file in WaterCAD or WaterGEMS V8i. If you have a source file for the model, such as a shapefile, ModelBuilder is a good tool for this.
Converting older WaterCAD/WaterGEMS files into WaterCAD/WaterGEMS V8i format and saving presentation settings