I'm using the blender add-on Auto_rig_pro to rig a KOIKATSU model, but I'm having trouble with an error like this. Does anyone know of another method or solution?

Overwatch-Ik-Rig-Blender-Addon Generates a ik rig for overwatch models extracted from datatool/datawatch To Install, Download the recent zip file (just select it under the readme file and click ...

Rig Creator’s beta rebuild adds facial rig, Relationship tool, overhauled bone generators, and English names—now free for Blender users.

The entire system is controlled by its virtual model in Blender 3D. You probably already know that Blender 3D is an open source 3-dimensional modeling suite.