Symfony custom configuration - namespace issue

Question

Following the advice posted at Loading custom config file for app in symfony2 I stucked into namespace issue.

In \src\AppBundle\DependencyInjection I have two files:

AppExtension.php:

<?php
namespace AppBundle\DependencyInjection;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;
use Symfony\Component\Validator\Tests\Fixtures\Entity;
use AppBundle\DependencyInjection\Configuration;

/**
 * This is the class that loads and manages your bundle configuration
 */
class AppExtension extends Extension
{
    /**
     * {@inheritdoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $container->setParameter('kh', $config['kh']);

        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('general.yml'); # another file of yours

    }
}

and Configuration.php:

<?
namespace AppBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

class Configuration implements ConfigurationInterface
{
    public function getConfigTreeBuilder()
    {
         $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('kh');

         $rootNode
            ->children()
            ->arrayNode('tags')
            ->prototype('array')
                ->children()
                    ->scalarNode('name')->isRequired()->end();
                    ->scalarNode('role')->isRequired()->end();
                    ->scalarNode('priority')->isRequired()->end();
                    ->scalarNode('label')->isRequired()->end();
                ->end();
            ->end();
        ->end();

        return $treeBuilder;
    }
}

It seems that I make some kind of mistake naming the files as executing:

php app/console cache:clear --env=prod

results in:

PHP Fatal error: Class 'AppBundle\DependencyInjection\Configuration' not found in /var/www/dev.investmentopportunities.pl/src/AppBundle/DependencyInjection/AppExtension.php on line 22 [2015-08-02 10:39:36] php.EMERGENCY: Fatal Error: Class 'AppBundle\DependencyInjection\Configuration' not found {"type":1,"file":"/var/www/dev.investmentopportunities.pl/src/AppBundle/DependencyInjection/AppExtension.php","line":22,"level":6143,"stack":[]}

Unluckily I have a problem with finding the error on my own. I have tried to rename files but still the error occurs. Could you please advice what am I doing wrong?

UPDATE 1:

As sugested by @San Thapa I have tried also to remove "use" command. This results in:

PHP Fatal error: Class 'AppBundle\DependencyInjection\Configuration' not found in /var/www/dev.investmentopportunities.pl/src/AppBundle/DependencyInjection/AppExtension.php on line 21 [2015-08-02 12:05:27] php.EMERGENCY: Fatal Error: Class 'AppBundle\DependencyInjection\Configuration' not found {"type":1,"file":"/var/www/dev.investmentopportunities.pl/src/AppBundle/DependencyInjection/AppExtension.php","line":21,"level":6143,"stack":[]}

[Symfony\Component\Debug\Exception\ClassNotFoundException] Attempted to load class "Configuration" from namespace "AppBundle\Dependenc yInjection". Did you forget a "use" statement for e.g. "Symfony\Bundle\TwigBundle\Depend encyInjection\Configuration", "Symfony\Bundle\DebugBundle\DependencyInjecti on\Configuration", "Symfony\Bundle\WebProfilerBundle\DependencyInjection\Co nfiguration", "Symfony\Bundle\FrameworkBundle\Tests\Functional\Bundle\TestB undle\DependencyInjection\Configuration", "Symfony\Bundle\FrameworkBundle\D ependencyInjection\Configuration", "Genemu\Bundle\FormBundle\DependencyInje ction\Configuration", "Doctrine\ORM\Configuration", "Doctrine\DBAL\Configur ation", "Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection\Configurat ion", "Symfony\Bundle\SwiftmailerBundle\DependencyInjection\Configuration", "Symfony\Bundle\MonologBundle\DependencyInjection\Configuration", "Symfony \Bundle\AsseticBundle\DependencyInjection\Configuration", "Sensio\Bundle\Fr ameworkExtraBundle\DependencyInjection\Configuration", "PUGX\AutocompleterB undle\DependencyInjection\Configuration", "Knp\Bundle\PaginatorBundle\Depen dencyInjection\Configuration", "FOS\UserBundle\DependencyInjection\Configur ation" or "Doctrine\Bundle\DoctrineBundle\DependencyInjection\Configuration "?

What seems a bit strange acessing the webpage from browser does not result in any error.

Answer 1

Just added to first line of Configuration.php:

<?php

and also remove semicolons:

$rootNode
        ->children()
        ->arrayNode('tags')
        ->prototype('array')
            ->children()
                ->scalarNode('name')->isRequired()->end()
                ->scalarNode('role')->isRequired()->end()
                ->scalarNode('priority')->isRequired()->end()
                ->scalarNode('label')->isRequired()->end()
            ->end()
        ->end()
    ->end();

I'm not sure about structure... Maybe you forgot add one more end()...