Unity Mars : Null Refrence Error while creating body poses

Question

Unity Mars Error Video for refrence

While creating body pose using Unity Body expression action facing a null refrence issue.

I am trying to create body pose data which I am not able to because of this null error from BodyTrackingModule.cs (Unity MARS inbuilt script).

1. I tried creating body poses using MARS default body
2. I tried a 3D avatar from Mixamo
3. I tried to implement the above two ways in windows as well as Mac. Same issue occured in both cases

Unity MARS console error BodyTrackingModule.cs

I also followed the Unity MARS document of creating pose.

What I want to achieve: A proper body pose data file after Create Body Pose under Body Expression Action so I can use trigger events on body Poses functionality in my project.

I am using Unity version 2020.3.40 LTS (iOS platform)