I have just upgraded moodle 1.9 to 2.1, and i have a problem.
when i join a new course, i must "enrol me" this course, but, i click "enrol me", i see a blank page, it's not auto view this course. i must come back, and choose this course, why? who can help me?
i try upload image but appear error " invalid JSON string" , i don't know what?