Yet Another Blender Egg Exporter (YABEE)

I run blender from command prompt. I try export animated model with the script. This the report:
read blend: D:\test-boks.blend
Traceback (most recent call last):
File “D:\test-boks.blend\blender25_egg_export.”, line 889, in
File “D:\test-boks.blend\blender25_egg_export.”, line 879, in write_out
File “D:\test-boks.blend\blender25_egg_export.”, line 101, in get_full_egg_str

File “D:\test-boks.blend\blender25_eqq_export.”, line 86, in get_full_egg_str
File “D:\test-boks.blend\blender25_eqq_export.”, line 588, in get_full_egg_str

File “D:\test-boks.blend\blender25_egg_export.”, line 579, in get_joints_str
AttributeError: ‘NoneType’ object has no attribute ‘data’

Well? I am not sure if it’s what you want to know.