Fatal error: Uncaught Error: Call to a member function getPublishedProducts() on null in /var/www/project/src/Controller/ProductController.php:174 Stack trace: #0 /var/www/project/vendor/symfony/http-kernel/HttpKernel.php(163): App\Controller\ProductController->listProductProvider(NULL, NULL) #1 /var/www/project/vendor/symfony/http-kernel/HttpKernel.php(75): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #2 /var/www/project/vendor/symfony/http-kernel/Kernel.php(202): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #3 /var/www/project/public/index.php(28): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #4 {main} thrown in /var/www/project/src/Controller/ProductController.php on line 174