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[JEBranch]

I am getting a error when viewing or submitting a ticket, I am using version 7.2.3 with templates six.

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Error: Class 'HTMLPurifier_PropertyList' not found in /home/xxxxxxxxx/public_html/xxxxxxxx/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Config.php:109
Stack trace:
#0 /home/xxxxxxxx/public_html/xxxxxxxx/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Config.php(157): HTMLPurifier_Config->__construct(Object(HTMLPurifier_ConfigSchema))
#1 /home/xxxxxxxx/public_html/xxxxxxxx/vendor/whmcs/whmcs-foundation/lib/View/Markup/Markdown/Markdown.php(0): HTMLPurifier_Config::createDefault()
#2 /home/xxxxxxxx/public_html/xxxxxxxx/vendor/michelf/php-markdown/Michelf/Markdown.php(187): WHMCS\View\Markup\Markdown\Markdown->doHtmlPurifier('

\n ...')
#3 /home/xxxxxxxx/public_html/xxxxxxxx/vendor/whmcs/whmcs-foundation/lib/View/Markup/Markup.php(0): Michelf\Markdown->transform('

\n ...')
#4 /home/xxxxxxxx/public_html/xxxxxxxx/admin/supporttickets.php(0): WHMCS\View\Markup\Markup->transform('> quote hereHel...', 'markdown')
#5 {main}

Thanks Jim