Thread:Project:Support desk/Unable to CreateUser with 1.24.1

mw 1.24.1 (updated from 1.23.8 which worked fine) Error message: Catchable fatal error: Argument 1 passed to MailAddress::newFromUser must be an instance of User, string given, called in /home/content/09/5084009/html/canprint/wiki/includes/User.php on line 3996 and defined in /home/content/09/5084009/html/canprint/wiki/includes/mail/MailAddress.php on line 59

Oddly, emails were received by the "target test account", and the WikiSysop received email notification.