AttributeError: 'NoneType' object has no attribute 'full_identifier'

[zhaojiachen1994]

Hi, I am very interested in this great work.

I meet the following errors when I run the view_model.py. I use the param file "../params/july15/JDM25.yaml" and set params["ARENA_TYPE"] = "DannceArena" in rodent_environments.py.

Can you tell me where I'm wrong? Thank you!

  File "C:\Users\admin\anaconda3\envs\mimic\lib\site-packages\dm_control\mjcf\skin.py", line 85, in serialize
    body_bytes = bone.body().full_identifier.encode('utf-8')
AttributeError: 'NoneType' object has no attribute 'full_identifier'