The 'remuiformat' course format does not define the format_remuiformat\output\renderer renderer class. This is required since Moodle 4.0.

• line 1396 of /course/format/classes/base.php: call to debugging()
• line 3784 of /course/lib.php: call to core_courseformat\base->get_renderer()
• line 65 of /theme/moove/layout/drawers.php: call to core_course_drawer()
• line 1477 of /lib/outputrenderers.php: call to include()
• line 1403 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
• line 1979 of /lib/setuplib.php: call to core_renderer->header()
• line 107 of /mod/forum/post.php: call to bootstrap_renderer->__call()