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Joomla\CMS\Mail\MailerFactory::createMailer(): Return value must be of type Joomla\CMS\Mail\MailerInterface, Joomla\CMS\Mail\Mail returned

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Call stack
# Function Location
1 () JROOT/libraries/src/Mail/MailerFactory.php:106
2 Joomla\CMS\Mail\MailerFactory->createMailer() JROOT/libraries/src/Factory.php:708
3 Joomla\CMS\Factory::createMailer() JROOT/libraries/src/Factory.php:490
4 Joomla\CMS\Factory::getMailer() JROOT/libraries/src/Mail/MailTemplate.php:103
5 Joomla\CMS\Mail\MailTemplate->__construct() JROOT/plugins/system/updatenotification/src/Extension/UpdateNotification.php:239
6 Joomla\Plugin\System\UpdateNotification\Extension\UpdateNotification->onAfterRender() JROOT/libraries/src/Plugin/CMSPlugin.php:289
7 Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() JROOT/libraries/vendor/joomla/event/src/Dispatcher.php:486
8 Joomla\Event\Dispatcher->dispatch() JROOT/libraries/src/Application/EventAware.php:111
9 Joomla\CMS\Application\WebApplication->triggerEvent() JROOT/libraries/src/Application/CMSApplication.php:1031
10 Joomla\CMS\Application\CMSApplication->render() JROOT/libraries/src/Application/SiteApplication.php:724
11 Joomla\CMS\Application\SiteApplication->render() JROOT/libraries/src/Application/CMSApplication.php:298
12 Joomla\CMS\Application\CMSApplication->execute() JROOT/includes/app.php:61
13 require_once() JROOT/index.php:32