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Hook callback definition contains invalid 'callback' method name in 'local_nelcxapi'. Callback method not found.

• line 235 of /lib/classes/hook/manager.php: call to debugging()
• line 189 of /lib/classes/hook/manager.php: call to core\hook\manager->is_callback_valid()
• line 304 of /lib/classes/hook/manager.php: call to core\hook\manager->getListenersForEvent()
• line 988 of /lib/classes/output/core_renderer.php: call to core\hook\manager->dispatch()
• line 81 of /course/index.php: call to core\output\core_renderer->footer()