qtype_random was removed from core, and random questions now use question set references. You must not use the name qtype_random for another plugin, as the questions will not work correctly.

• line 1546 of /public/lib/classes/component.php: call to debugging()
• line 1063 of /public/lib/classes/component.php: call to core\component::is_valid_plugin_name()
• line 670 of /public/lib/classes/component.php: call to core\component::fetch_plugins()
• line 397 of /public/lib/classes/component.php: call to core\component::fill_all_caches()
• line 256 of /public/lib/classes/component.php: call to core\component::init()
• line 65 of /public/lib/dmllib.php: call to core\component::classloader()
• line 217 of /public/install.php: call to require_once()