Hello Alex,
This particular issue seems to be related with ARKit, and appeared recently. Our developer team is already aware of this problem and checking for solutions.
The entry in the CSV file generated by Arkit is 'BlendshapeCount', not 'BlendShapeCount', so this is causing an AssertError and failure in the script. In the meantime, please modify the .CSV file to reflect the correct name of the column.
Please let us know if this solves this error code.
Regards,
Sebastian