Notice: unserialize(): Error at offset 61 of 1149 bytes in C:\xampp\htdocs\monsters.php on line 17

Fatal error: Uncaught Error: Call to a member function getItemLevelRange() on bool in C:\xampp\htdocs\monsters.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\monsters.php on line 18