Fatal error: Uncaught Error: Class "HTMLPurifier_Strategy" not found in C:\Apache24\htdocs\cms_upgrade\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Strategy\FixNesting.php:32 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\ezyang\htmlpurifier\library\HTMLPurifier\Strategy\FixNesting.php on line 32