This page should be using theme custom_corners which cannot be initialised. Falling back to the site theme boost

• line 718 of /lib/outputlib.php: call to debugging()
• line 1739 of /lib/pagelib.php: call to theme_config::load()
• line 756 of /lib/pagelib.php: call to moodle_page->initialise_theme_and_output()
• line 1011 of /lib/pagelib.php: call to moodle_page->magic_get_theme()
• line 74 of /mod/folder/view.php: call to moodle_page->get_renderer()