Fatal error: Uncaught Error: Class 'HTMLPurifier_Printer' not found in D:\xampp\htdocs\psp\backend\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Printer\ConfigForm.php:6 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Printer\ConfigForm.php on line 6