@mikael I reread your post and tried again. Print Traceback does show the complete error. Thanks. I had clicked it before but didn't realize it meant "print traceback in console window" even though that is obvious in retrospect. Where else would it print? Thanks again.
BTW closing the popup doesn't show the console. It just returns to the app. I had to quit the app which returned to the editor, then switch from the editor to the console see the traceback.