I just renewed my license and when I went to import my classes, no classes show up.

I receive this error message when I try to import my gradebook from Google Classroom. I have never had this trouble until today. Error: Import unsuccessful: TypeError: Cannot call method "toLowerCase" of undefined. at gs/Classroom Import v2 (GradeBook for Google Sheets and Classroom):221 at gs/Classroom Import v2 (GradeBook for Google Sheets and Classroom):221 (updateBook_v2)