This page should be using theme boost_magnific which cannot be initialised. Nor can the site theme boost_magnific. Falling back to boost

• line 462 of /lib/classes/output/theme_config.php: call to debugging()
• line 1847 of /lib/pagelib.php: call to core\output\theme_config::load()
• line 761 of /lib/pagelib.php: call to moodle_page->initialise_theme_and_output()
• line 1009 of /lib/pagelib.php: call to moodle_page->magic_get_theme()
• line 124 of /index.php: call to moodle_page->get_renderer()