Metadata information mismatch!
The information in the metadata file does not match the information in the character scene! Please generate a new metadata file using the addon. Do not alter any files after the addon validation passes.
This message indicates that the information from the metadata file is not available in the scene. This can happen if, for example, the naming of objects changes after they have been assigned in the addon or after the metadata.json was generated.
In this case, reassign the objects in the addon and run the validation again.