After upgrading to 4.5 Betas you will likely be getting the below system error, and users will be unable to register with Classifieds on. I am not sure how to fix it and I am afraid waiting for releasing the final forum version + time to develop updated Classifieds will take a lot of time...
ArgumentCountError: Too few arguments to function IPS\core\modules\front\system\_register::_createMember(), 2 passed in /www/doc/www.....com/www/init.php(871) : eval()'d code on line 17 and exactly 4 expected (0)
#0 /www/doc/www.....com/www/init.php(871) : eval()'d code(17): IPS\core\modules\front\system\_register::_createMember(Array, Array)
#1 /www/doc/www.....com/www/init.php(871) : eval()'d code(13): IPS\core\modules\front\system\classifieds_hook_newMemberCredit::_createMember(Array, Array, NULL)
#2 /www/doc/www......com/www/applications/core/modules/front/system/register.php(239): IPS\core\modules\front\system\hook1574::_createMember(Array, Array, NULL, Object(IPS\Helpers\Form))
#3 /www/doc/www.......com/www/applications/core/modules/front/system/register.php(102): IPS\core\modules\front\system\_register->_registrationForm(NULL)
#4 /www/doc/www.......com/www/init.php(871) : eval()'d code(27): IPS\core\modules\front\system\_register->manage()
#5 /www/doc/www.......com/www/system/Dispatcher/Controller.php(101): IPS\core\modules\front\system\nexus_hook_register->manage()
#6 /www/doc/www.......com/www/system/Dispatcher/Dispatcher.php(152): IPS\Dispatcher\_Controller->execute()
#7 /www/doc/www.......com/www/index.php(13): IPS\_Dispatcher->run()
#8 {main}