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Warning: Attempt to read property "dirroot" on null in C:\Apache24\htdocs\moodle\message\output\airnotifier\message_output_airnotifier.php on line 28

Warning: require_once(/message/output/lib.php): Failed to open stream: No such file or directory in C:\Apache24\htdocs\moodle\message\output\airnotifier\message_output_airnotifier.php on line 28

Fatal error: Uncaught Error: Failed opening required '/message/output/lib.php' (include_path='.;C:\php\pear') in C:\Apache24\htdocs\moodle\message\output\airnotifier\message_output_airnotifier.php:28 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\message\output\airnotifier\message_output_airnotifier.php on line 28