Fatal error: Uncaught Error: Class 'HTMLPurifier_ChildDef' not found in C:\Web\htdocs\vendor-copia\ezyang\htmlpurifier\library\HTMLPurifier\ChildDef\Required.php:6 Stack trace: #0 {main} thrown in C:\Web\htdocs\vendor-copia\ezyang\htmlpurifier\library\HTMLPurifier\ChildDef\Required.php on line 6