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Warning: Attempt to read property "dirroot" on null in /var/www/html/public/index.php on line 31

Warning: require_once(/course/lib.php): Failed to open stream: No such file or directory in /var/www/html/public/index.php on line 31

Fatal error: Uncaught Error: Failed opening required '/course/lib.php' (include_path='.:/usr/local/lib/php') in /var/www/html/public/index.php:31 Stack trace: #0 {main} thrown in /var/www/html/public/index.php on line 31