Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class MaxiaTaxSwitch\Subscriber\Frontend does not have a method "onPostDispatchFrontendDetail" in /var/www/clients/client9/web9/web/engine/Library/Enlight/Event/Handler/Default.php:90 Stack trace: #0 /var/www/clients/client9/web9/web/engine/Library/Enlight/Event/EventManager.php(207): Enlight_Event_Handler_Default->execute() #1 /var/www/clients/client9/web9/web/engine/Library/Enlight/Controller/Action.php(220): Enlight_Event_EventManager->notify() #2 /var/www/clients/client9/web9/web/engine/Library/Enlight/Controller/Dispatcher/Default.php(467): Enlight_Controller_Action->dispatch() #3 /var/www/clients/client9/web9/web/engine/Library/Enlight/Controller/Front.php(226): Enlight_Controller_Dispatcher_Default->dispatch() #4 /var/www/clients/client9/web9/web/engine/Shopware/Kernel.php(195): Enlight_Controller_Front->dispatch() #5 /var/www/clients/client9/web9/web/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(85): Shopware\Kernel->handle() #6 /var/www/clients/client9/web9/web/vendor/symfony/http-kernel/HttpCache/HttpCache.php(479): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle() #7 /var/www/clients/client9/web9/web/engine/Shopware/Components/HttpCache/AppCache.php(270): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward() #8 /var/www/clients/client9/web9/web/vendor/symfony/http-kernel/HttpCache/HttpCache.php(452): Shopware\Components\HttpCache\AppCache->forward() #9 /var/www/clients/client9/web9/web/vendor/symfony/http-kernel/HttpCache/HttpCache.php(346): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch() #10 /var/www/clients/client9/web9/web/engine/Shopware/Components/HttpCache/AppCache.php(196): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup() #11 /var/www/clients/client9/web9/web/vendor/symfony/http-kernel/HttpCache/HttpCache.php(224): Shopware\Components\HttpCache\AppCache->lookup() #12 /var/www/clients/client9/web9/web/engine/Shopware/Components/HttpCache/AppCache.php(117): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle() #13 /var/www/clients/client9/web9/web/shopware.php(122): Shopware\Components\HttpCache\AppCache->handle() #14 {main} thrown in /var/www/clients/client9/web9/web/engine/Library/Enlight/Event/Handler/Default.php on line 90