After running modelbuilder in WaterGEMS for ArcMap to create a network using my pipes shapefile or pipe feature class only one pipe is create and the following error is sometimes displayed:
Exception in Object.: NullReferenceException: Object reference not set to an instance of an object.
This problem appears to be due to not running the software as an administrator or not having administrative privlidges, which causes certain modules to not be able to communicate or write information.
For Windows 7
For Windows 8.1 and above that
When shutting down ArcMap 10.1 a COM error is thrown
Using ModelBuilder to Import External Data