Debugging: Format plugin format_flexpage is not found. Using default format_topcoll in ./course/format/lib.php on line 126.
Stack trace:

• line 126 of ./course/format/lib.php: call to debugging()
• line 187 of ./course/format/lib.php: call to format_base::get_format_or_default()
• line 35 of ./course/format/lib.php: call to format_base::instance()
• line 2686 of ./lib/modinfolib.php: call to course_get_format()
• line 545 of ./lib/modinfolib.php: call to section_info->__construct()
• line 418 of ./lib/modinfolib.php: call to course_modinfo->__construct()
• line 2171 of ./lib/modinfolib.php: call to course_modinfo::instance()
• line 2609 of ./lib/moodlelib.php: call to get_fast_modinfo()
• line 42 of ./mod/lesson/view.php: call to require_login()