this happen after request new affilite account ?! joomla 4

Error: 0
0
Call to a member function register() on bool

and when enable the php error i get

# Function Location
1 () JROOT/components/com_affiliatetracker/controller.php:351
2 AffiliateController->addNewJoomlaUser() JROOT/components/com_affiliatetracker/controller.php:180
3 AffiliateController->save_account() JROOT/libraries/src/MVC/Controller/BaseController.php:693
4 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/components/com_affiliatetracker/affiliatetracker.php:59
5 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71
6 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73
7 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
8 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/SiteApplication.php:208
9 Joomla\CMS\Application\SiteApplication->dispatch() JROOT/libraries/src/Application/SiteApplication.php:249
10 Joomla\CMS\Application\SiteApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293
11 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
12 require_once() JROOT/index.php:32