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Can not execute event observer '\plugintype_pluginname\event\observer\course_module_created::store'

line 164 of /lib/classes/event/manager.php: call to debugging()
line 75 of /lib/classes/event/manager.php: call to core\event\manager::process_buffers()
line 795 of /lib/classes/event/base.php: call to core\event\manager::dispatch()
line 516 of /mod/page/lib.php: call to core\event\base->trigger()
line 55 of /mod/page/view.php: call to page_view()