Hydratec Inc.

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Revit Based HydraCAD (Ribbon/Toolbar/Location)

Button: Spacing and Layout Function: New Head from Selector

Description:

Revit could not complete the external command... System.NullReferenceException

Solutions:

Cause:

There are not any sprinkler families loaded, which can be verified by viewing the Project Browser. 
Solution:

Add sprinkler families to the model not using the head selector, most easily done with one of Hydratec's provided templates. 

After the sprinkler families are loaded into the project, the head selector will work without issue. 

Note: This is an error on Hydratec's end, and this will be resolved in a Revit update past version 23.0.001

If you are encountering this error on software version 23.0.001, and there is an update available, please upgrade to version 23.0.002 or later to resolve this error. 
Updated: Sept. 18, 2022, 2:41 a.m. Created: July 13, 2022, 1:44 a.m.