Fatal error: Uncaught Symfony\Component\DependencyInjection\Exception\InvalidArgumentException: Expected to find class "App\Utils\ANTLR\AccordListener" in file "/var/www/html/src/Utils/ANTLR/AccordListener.php" while importing services from resource "../src/", but it was not found! Check the namespace prefix used with the resource. in /var/www/html/vendor/symfony/dependency-injection/Loader/FileLoader.php:300 Stack trace: #0 /var/www/html/vendor/symfony/dependency-injection/Loader/FileLoader.php(121): Symfony\Component\DependencyInjection\Loader\FileLoader->findClasses('App\\', '../src/', Array, Object(Symfony\Component\DependencyInjection\Compiler\RegisterAutoconfigureAttributesPass), '/var/www/html/c...') #1 /var/www/html/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(705): Symfony\Component\DependencyInjection\Loader\FileLoader->registerClasses(Object(Symfony\Component\DependencyInjection\Definition), 'App\\', '../src/', Array, '/var/www/html/c...') #2 /var/www/html/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(254): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->parseDefinition('App\\', Array, '/var/www/html/c...', Array, false, true) #3 /var/www/html/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(177): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->parseDefinitions(Array, '/var/www/html/c...') #4 /var/www/html/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php(133): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->loadContent(Array, '/var/www/html/c...') #5 /var/www/html/vendor/symfony/config/Loader/FileLoader.php(167): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->load('/var/www/html/c...', NULL) #6 /var/www/html/vendor/symfony/config/Loader/FileLoader.php(98): Symfony\Component\Config\Loader\FileLoader->doImport('/var/www/html/c...', NULL, false, '/var/www/html/s...') #7 /var/www/html/vendor/symfony/dependency-injection/Loader/FileLoader.php(70): Symfony\Component\Config\Loader\FileLoader->import('/var/www/html/c...', NULL, false, '/var/www/html/s...') #8 /var/www/html/vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php(64): Symfony\Component\DependencyInjection\Loader\FileLoader->import('/var/www/html/c...', NULL, false, '/var/www/html/s...') #9 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(57): Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator->import('/var/www/html/c...') #10 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(190): App\Kernel->configureContainer(Object(Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator), Object(Symfony\Component\Config\Loader\DelegatingLoader), Object(Symfony\Component\DependencyInjection\ContainerBuilder)) #11 /var/www/html/vendor/symfony/dependency-injection/Loader/ClosureLoader.php(36): App\Kernel->Symfony\Bundle\FrameworkBundle\Kernel\{closure}(Object(Symfony\Component\DependencyInjection\ContainerBuilder), 'prod') #12 /var/www/html/vendor/symfony/config/Loader/DelegatingLoader.php(37): Symfony\Component\DependencyInjection\Loader\ClosureLoader->load(Object(Closure), NULL) #13 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(146): Symfony\Component\Config\Loader\DelegatingLoader->load(Object(Closure)) #14 /var/www/html/vendor/symfony/http-kernel/Kernel.php(615): App\Kernel->registerContainerConfiguration(Object(Symfony\Component\Config\Loader\DelegatingLoader)) #15 /var/www/html/vendor/symfony/http-kernel/Kernel.php(505): Symfony\Component\HttpKernel\Kernel->buildContainer() #16 /var/www/html/vendor/symfony/http-kernel/Kernel.php(770): Symfony\Component\HttpKernel\Kernel->initializeContainer() #17 /var/www/html/vendor/symfony/http-kernel/Kernel.php(185): Symfony\Component\HttpKernel\Kernel->preBoot() #18 /var/www/html/vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php(35): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #19 /var/www/html/vendor/autoload_runtime.php(29): Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run() #20 /var/www/html/public/index.php(5): require_once('/var/www/html/v...') #21 {main} Next Symfony\Component\Config\Exception\LoaderLoadException: Expected to find class "App\Utils\ANTLR\AccordListener" in file "/var/www/html/src/Utils/ANTLR/AccordListener.php" while importing services from resource "../src/", but it was not found! Check the namespace prefix used with the resource in /var/www/html/config/services.yaml (which is being imported from "/var/www/html/src/Kernel.php"). in /var/www/html/vendor/symfony/config/Loader/FileLoader.php:182 Stack trace: #0 /var/www/html/vendor/symfony/config/Loader/FileLoader.php(98): Symfony\Component\Config\Loader\FileLoader->doImport('/var/www/html/c...', NULL, false, '/var/www/html/s...') #1 /var/www/html/vendor/symfony/dependency-injection/Loader/FileLoader.php(70): Symfony\Component\Config\Loader\FileLoader->import('/var/www/html/c...', NULL, false, '/var/www/html/s...') #2 /var/www/html/vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php(64): Symfony\Component\DependencyInjection\Loader\FileLoader->import('/var/www/html/c...', NULL, false, '/var/www/html/s...') #3 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(57): Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator->import('/var/www/html/c...') #4 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(190): App\Kernel->configureContainer(Object(Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator), Object(Symfony\Component\Config\Loader\DelegatingLoader), Object(Symfony\Component\DependencyInjection\ContainerBuilder)) #5 /var/www/html/vendor/symfony/dependency-injection/Loader/ClosureLoader.php(36): App\Kernel->Symfony\Bundle\FrameworkBundle\Kernel\{closure}(Object(Symfony\Component\DependencyInjection\ContainerBuilder), 'prod') #6 /var/www/html/vendor/symfony/config/Loader/DelegatingLoader.php(37): Symfony\Component\DependencyInjection\Loader\ClosureLoader->load(Object(Closure), NULL) #7 /var/www/html/vendor/symfony/framework-bundle/Kernel/MicroKernelTrait.php(146): Symfony\Component\Config\Loader\DelegatingLoader->load(Object(Closure)) #8 /var/www/html/vendor/symfony/http-kernel/Kernel.php(615): App\Kernel->registerContainerConfiguration(Object(Symfony\Component\Config\Loader\DelegatingLoader)) #9 /var/www/html/vendor/symfony/http-kernel/Kernel.php(505): Symfony\Component\HttpKernel\Kernel->buildContainer() #10 /var/www/html/vendor/symfony/http-kernel/Kernel.php(770): Symfony\Component\HttpKernel\Kernel->initializeContainer() #11 /var/www/html/vendor/symfony/http-kernel/Kernel.php(185): Symfony\Component\HttpKernel\Kernel->preBoot() #12 /var/www/html/vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php(35): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #13 /var/www/html/vendor/autoload_runtime.php(29): Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run() #14 /var/www/html/public/index.php(5): require_once('/var/www/html/v...') #15 {main} thrown in /var/www/html/vendor/symfony/config/Loader/FileLoader.php on line 182