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AutoCAD Based Display (Ribbon/Toolbar/Location)

Error Type: Bad Argument

Description:

Trying the DDL command gives the error; 

Usage: (acad_strlsort <list of strings>)

Error bad argument type: consp nil



Solutions:

Cause:

AutoCAD 2026 was updated from 2026.1.1 to 2026.12
Solution:

What not to do?

 

  • Do not update or install to 2026.1.2 if possible
  • 2025 will be affected mid-September by the same programming change

 

What to do?

 

  • Install and use 2024 as that will not be affected and it is the most solid version
  • Install HydraCAD v57.08 and update to v57.09

OR

  • Uninstall AutoCAD 2026 only (no need to uninstall HydraCAD)
  • Go to the START menu, run the file "Configure AutoCAD for HydraCAD v58"



This does NOT work:

Autodesk says they provide an option to download the original/pre-updated version.  

1. Select 'Specific Version'



After installing "the old" version, upon opening AutoCAD, it still showed 2026.1.2

Thanks for trying Vasyl D
Updated: Aug. 19, 2026, 4:01 p.m. Created: Aug. 19, 2026, 3:59 p.m.