Teacher cannot add questions from bank database..

Johnny Flores
Hello, I'm having trouble getting a TEACHER to add questions from the database to a particular quiz. I have given the TEACHER a STUDENT MANAGER rights as suggested from the Opigno manual. I can view the questions, I can also select the questions to add to the quiz but when I click the submit button, I get the following error "One of the supplied questions was invalid. It has been removed from the quiz. " Any ideas? Thank you so much for your help.