Still errors at the end of 9.3.2 Create User Roles

I’m following the “Become a Rapid Developer” learning path, I have finished the instuctions of 9.3.2 Create User Roles for the second time, after having restarted from scratch, and I still have 6 errors at the end of the procedure: They appeared as soon as I renamed the User role into Teacher, and never disappeared since. Do you know what’s going wrong? Mendix version is 9.1.0.