Someone who has succeeded in getting the new "Create ML" features in Catalina XCode beta yet to do object classification? I have followed all the steps of WWDC 2019 video # 424, but get error messages related to JSON. I wonder if it is me or if this part of the system is not working, as it is still in Beta. All the guides I see are for image classification, and it works well for me. So I'd like to confirm one way or another on the object classification system. Thanks.