I suppose GDL Adapter is not working with Autocad 2005 (according to Graphisoft it works only with 2000 and 2002), but maybe somebody has been successful.
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Gorazd Rajh
From AC 6.5 onward, Ryzen 9 5900HS, 48 GB RAM, RTX 3080, Win 11
The problem may be with ArchiCAD. The GDL adapter for autocad has yet to be adapted to work with AC8.1. You currently must create the library part in AC7 or earlier.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"