Fatal error: Uncaught Error: Class "MailPoet\Config\Installer" not found in /htdocs/wp-content/plugins/mailpoet/lib/Util/Notices/PremiumFeaturesAvailableNotice.php:39
Stack trace:
#0 /htdocs/wp-content/plugins/mailpoet/lib/Util/Notices/PermanentNotices.php(95): MailPoet\Util\Notices\PremiumFeaturesAvailableNotice->__construct(Object(MailPoet\Util\License\Features\Subscribers), Object(MailPoet\Config\ServicesChecker), Object(MailPoet\WP\Functions))
#1 /htdocs/wp-content/plugins/mailpoet/generated/FreeCachedContainer.php(2640): MailPoet\Util\Notices\PermanentNotices->__construct(Object(MailPoet\WP\Functions), Object(MailPoet\Settings\TrackingConfig), Object(MailPoet\Subscribers\SubscribersRepository), Object(MailPoet\Settings\SettingsController), Object(MailPoet\Util\License\Features\Subscribers), Object(MailPoet\Config\ServicesChecker), Object(MailPoet\Mailer\MailerFactory), Object(MailPoet\Util\Notices\SenderDomainAuthenticationNotices))
#2 /htdocs/wp-content/plugins/mailpoet/vendor-prefixed/symfony/dependency-injection/Container.php(122): MailPoetGenerated\FreeCachedContainer->getInitializerService()
#3 /htdocs/wp-content/plugins/mailpoet/vendor-prefixed/symfony/dependency-injection/Container.php(110): MailPoetVendor\Symfony\Component\DependencyInjection\Container->make('MailPoet\\Config...', 1)
#4 /htdocs/wp-content/plugins/mailpoet/lib/DI/ContainerWrapper.php(39): MailPoetVendor\Symfony\Component\DependencyInjection\Container->get('MailPoet\\Config...')
#5 /htdocs/wp-content/plugins/mailpoet/mailpoet_initializer.php(89): MailPoet\DI\ContainerWrapper->get('MailPoet\\Config...')
#6 /htdocs/wp-content/plugins/mailpoet/mailpoet.php(194): require_once('/htdocs/wp-cont...')
#7 /htdocs/wp-settings.php(526): include_once('/htdocs/wp-cont...')
#8 /htdocs/wp-config.php(85): require_once('/htdocs/wp-sett...')
#9 /htdocs/wp-load.php(50): require_once('/htdocs/wp-conf...')
#10 /htdocs/wp-blog-header.php(13): require_once('/htdocs/wp-load...')
#11 /htdocs/index.php(17): require('/htdocs/wp-blog...')
#12 {main}
thrown in /htdocs/wp-content/plugins/mailpoet/lib/Util/Notices/PremiumFeaturesAvailableNotice.php on line 39