I see other users on this forum are having a similar issue, but I didn't want to hijack their posts. I am able to reproduce with my test account and the Error log keeps giving this:
[10-Nov-2022 15:05:19 UTC] PHP Fatal error: Uncaught Error: Class "Html" not found in C:\inetpub\wwwroot\wwwOSTicket\include\client\tickets.inc.php:174
Stack trace:
#0 C:\inetpub\wwwroot\wwwOSTicket\tickets.php(147): include()
#1 {main}
thrown in C:\inetpub\wwwroot\wwwOSTicket\include\client\tickets.inc.php on line 174
