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Warning: Undefined variable $PHP_SELF in C:\xampp\htdocs\pages\npcs\advanced_npcs.php on line 18

Fatal error: Uncaught Error: Call to undefined function SelectLevel() in C:\xampp\htdocs\pages\npcs\advanced_npcs.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\pages\npcs\advanced_npcs.php on line 22