Fatal error: Uncaught Error: Class "HTMLPurifier_AttrDef_CSS_Number" not found in /var/www/html/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php:3 Stack trace: #0 {main} thrown in /var/www/html/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/CSS/AlphaValue.php on line 3