Fatal error: Uncaught Error: Class 'HTMLPurifier_Strategy' not found in D:\xampp\htdocs\psp\backend\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Strategy\RemoveForeignElements.php:11 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Strategy\RemoveForeignElements.php on line 11