Warning: Undefined variable $DB in /mnt/web303/d1/04/510089604/htdocs/ng_MLG/ng_PublicRoot/php/DB_utils.php on line 15 Fatal error: Uncaught TypeError: mysqli_set_charset(): Argument #1 ($mysql) must be of type mysqli, null given in /mnt/web303/d1/04/510089604/htdocs/ng_MLG/ng_PublicRoot/php/DB_utils.php:15 Stack trace: #0 /mnt/web303/d1/04/510089604/htdocs/ng_MLG/ng_PublicRoot/php/DB_utils.php(15): mysqli_set_charset() #1 /mnt/web303/d1/04/510089604/htdocs/ng_MLG/ng_PublicRoot/courses.php(16): DB_oeffnen() #2 {main} thrown in /mnt/web303/d1/04/510089604/htdocs/ng_MLG/ng_PublicRoot/php/DB_utils.php on line 15