DFRM 2720.

Format plugin format_remuiformat is not found. Using default format_topics

line 137 of /course/format/classes/base.php: call to debugging()
line 198 of /course/format/classes/base.php: call to core_courseformat\base::get_format_or_default()
line 38 of /course/format/lib.php: call to core_courseformat\base::instance()
line 1165 of /lib/pagelib.php: call to course_get_format()
line 55 of /enrol/index.php: call to moodle_page->set_course()