Adding isaac camera to robot URDF file

Hello everyone,
I have an URDF file of robot and converted it to USD file using Isaac. I would like to add isaac camera to the URDF file of the robot. I open usd file of robot and add a camera connected to one link and save usd file again. But I could not add this usd file using the function “add_reference_to_stage”. The error is “AttributeError: ‘NoneType’ object has no attribute ‘is_homogeneous’”. Do you know what is problem?
Thank you

Hi @manhha1402 - Someone from our team will review and respond back to you.

Hi @manhha1402 - Apologies for the delay in response. Please let us know if you are still having any issues or questions after using the latest Isaac Sim release.