Pose bones missing!
Missing bones may negatively impact animation quality. Please make sure missing bones are left out intentionally.
This message indicates that there are missing bones in your main pose skeleton. If the missing bones are not a part of any bone chain or are not needed based on the character's design this message can be ignored. If the missing bone is a part of a bone chain, for example, a spine bone, this message should be considered as such bones are important for getting the best animation results possible.
Visit the AI Body MoCap page for more information.
Bones that are not mapped will be listed in the add-on. This is supposed to increase transparency and bring attention to where the loss of data will happen.