I am trying to run an Object Based classification using ArcPro. The part that I am having trouble with is generating a classification scheme from my existing feature class. I have a feature class containing information on tree genus, a value tied to that genus, an Object_ID field, and the necessary geometry and spatial columns. Whenever I load my feature class I receive the error message "Failed to generate classification schema from training samples". Could someone tell me what I am doing wrong? Do the columns need to have a specific name? Am I missing some information? Any help is appreciated.