Note: You are currently viewing documentation for Moodle 3.7. Up-to-date documentation for the latest stable version of Moodle may be available here: error/moodle/invalidcoursemodule.
The ID for the course module is invalid. Please contact the site admin.
For some unknown reason, this happens sometimes when deleting a user. Clicking the back button of the browser and deleting the user again, makes the deleting process continue and delete the user.