moodle_database::get_in_or_equal() error when viewing question bank of restored course

Thanks for the quick and detailed response! It turns out the backup was from version 3.9.

I'll try to do it step by step. Start with an empty question bank as you suggested (I suspect I might need to kill the quizzes that use it as well - we'll see), then add all questions of one type, then another, etc.

 

EDIT: I started by deleting all the quizzes and the question bank error disappeared! I can now access them all. 

I'd love the script, thanks! (I have both mac and linux)