3ds import script bug

I’m getting an error at line 358 in MakeMeshMaterialCopy

TypeError: connot concatenate 'str and ‘NoneType’ objects

any suggestions?

I am able to import this 3ds model with an earlier version of the script but then I dont get any of the uv mapping coordinates or texturing.

this is a complicated model and redoing those would take days.

Thanks
Steve