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AutoCAD Based Sprinklers (Ribbon/Toolbar/Location)

Button: Select Sprinkler Function: Head Selector Error Type: Bad Argument

Description:

When selecting "Retrieve Part Num/Desc <" from the sprinkler Block Definition window, you get the error;

Error: bad argument type: stringp nil





Solutions:

Cause:

File update issue, Head Selector application is too new for your HydraCAD for AutoCAD version

Solution:

Check your version of Head Selector, it is likely version 25.1.7.0 or newer

But your version of HydraCAD is v57.07 or v58.01


Until this is resolved and the update is released, you can either use the "Classic" Head Selector to generate a Part Number and Description OR you can manually type in your own values


Updated: Oct. 8, 2025, 11:12 a.m. Created: Oct. 8, 2025, 11:12 a.m.