Fatal error: Uncaught Error: Class "HTMLPurifier_AttrTransform" not found in E:\www\frey\qgmvc\v1.0\composer\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrTransform\ScriptRequired.php:6 Stack trace: #0 {main} thrown in E:\www\frey\qgmvc\v1.0\composer\vendor\ezyang\htmlpurifier\library\HTMLPurifier\AttrTransform\ScriptRequired.php on line 6