Error occurs when ElumTools is initialized.
Typically this error is solved by a simple Revit reboot. Please try the following:
- Close all instances of Revit (if you have it opened).
- Open one instance of Revit.
- Open the file you are trying to work on, without opening any other files.
- Immediately try to perform an ElumTools command.
Please contact Lighting Analysts Support if the problem persist.