TypeError: append() argument must be xml.etree.ElementTree.Element, not Element

[George121380]

Description

I encountered an error while running the task demo provided in the README. The issue persists across all my reproduction attempts.

Script I run

The error log:

What I Have Tried

• Tested with all versions of robosuite within the 1.3 and 1.4 release series. (Some versions lack certain functions. Others produce the same error.)

• Debugged the issue and found a potential cause: In the function "/home/george/anaconda3/envs/libero/lib/python3.8/site-packages/robosuite/models/objects/objects.py", line 383, in _get_object_subtree, I noticed that the obj class and ET.Element class share the same name but are actually different classes. I suspect that obj is redefined somewhere, which might be causing the issue. However, I was unable to resolve this conflict.

Any insights or solutions would be greatly appreciated. Thank you for your help!

[zhuyifengzju]

Hello, can you try with maybe v1.4 branch of robosuite and install from source. At this point, it's unclear to me if the issue comes from LIBERO codebase or from the robosuite side.