title: DoctrineMongoDBBundle getting a fatal error in Symfony2
body: <p>I'm following the directions here:
  <a href="http://symfony.com/doc/2.0/bundles/DoctrineMongoDBBundle/index.html">http://symfony.com/doc/2.0/bundles/DoctrineMongoDBBundle/index.html</a></p>
  
  <p>I have installed deps:</p>
  
  <pre><code>#deps
  [doctrine-mongodb]
      git=http://github.com/doctrine/mongodb.git
  
  [doctrine-mongodb-odm]
      git=http://github.com/doctrine/mongodb-odm.git
  
  [DoctrineMongoDBBundle]
      git=http://github.com/symfony/DoctrineMongoDBBundle.git
      target=/bundles/Symfony/Bundle/DoctrineMongoDBBundle
  </code></pre>
  
  <p>then did <code>$ php bin/vendors install</code></p>
  
  <p>I added the following:</p>
  
  <pre><code># app/autoload.php
  $loader-&gt;registerNamespaces(array(
      // ....
      'Doctrine\\Common' =&gt; __DIR__.'/../vendor/doctrine-common/lib',
      'Doctrine\\DBAL'   =&gt; __DIR__.'/../vendor/doctrine-dbal/lib',
      'Doctrine\\ODM\\MongoDB'    =&gt; __DIR__.'/../vendor/doctrine-mongodb-odm/lib',
      'Doctrine\\MongoDB'         =&gt; __DIR__.'/../vendor/doctrine-mongodb/lib',
      'Doctrine'         =&gt; __DIR__.'/../vendor/doctrine/lib',
      // ....
  ));
  
  AnnotationRegistry::registerFile(
      __DIR__.'/../vendor/doctrine/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php'
  );
  AnnotationRegistry::registerFile(
      __DIR__.'/../vendor/doctrine-mongodb-odm/lib/Doctrine/ODM/MongoDB/Mapping/Annotations/DoctrineAnnotations.php'
  );
  </code></pre>
  
  <p>I also added</p>
  
  <pre><code># app/AppKernel.php
  $bundles = array(
      //....
      new Symfony\Bundle\DoctrineMongoDBBundle\DoctrineMongoDBBundle(),
      //....
  );
  </code></pre>
  
  <p>And my doctrine configuration looks like:</p>
  
  <pre><code># Doctrine Configuration
  doctrine:
      dbal:
          driver:   %database_driver%
          host:     %database_host%
          port:     %database_port%
          dbname:   %database_name%
          user:     %database_user%
          password: %database_password%
          charset:  UTF8
  
      orm:
          auto_generate_proxy_classes: %kernel.debug%
          auto_mapping: true
  
  doctrine_mongodb:
      connections:
          default:
              server: mongodb://localhost:27017
              options:
                  connect: true
      default_database: dbtest
      document_managers:
          default:
              auto_mapping: true
  </code></pre>
  
  <p>But when I load the app I get the following error:</p>
  
  <pre><code>Fatal error: Class 'Symfony\Bridge\Doctrine\DependencyInjection\AbstractDoctrineExtension' not found in /Volumes/Master/SITES/example/vendor/bundles/Symfony/Bundle/DoctrineMongoDBBundle/DependencyInjection/DoctrineMongoDBExtension.php on line 31
  
  Call Stack:
      0.0002     643984   1. {main}() /Volumes/Master/SITES/example/web/app_dev.php:0
      0.0175    5274704   2. Symfony\Component\HttpKernel\Kernel-&gt;handle() /Volumes/Master/SITES/example/web/app_dev.php:31
      0.0176    5274800   3. Symfony\Component\HttpKernel\Kernel-&gt;boot() /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/HttpKernel/Kernel.php:168
      0.0212    5592040   4. Symfony\Component\HttpKernel\Kernel-&gt;initializeContainer() /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/HttpKernel/Kernel.php:127
      0.0232    5662744   5. Symfony\Component\HttpKernel\Kernel-&gt;buildContainer() /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/HttpKernel/Kernel.php:545
      0.0430    8473952   6. Symfony\Bundle\DoctrineMongoDBBundle\DoctrineMongoDBBundle-&gt;getContainerExtension() /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/HttpKernel/Kernel.php:630
      0.0430    8474568   7. Symfony\Component\ClassLoader\DebugUniversalClassLoader-&gt;loadClass() /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/ClassLoader/DebugUniversalClassLoader.php:0
      0.0437    8623704   8. require('/Volumes/Master/SITES/example/vendor/bundles/Symfony/Bundle/DoctrineMongoDBBundle/DependencyInjection/DoctrineMongoDBExtension.php') /Volumes/Master/SITES/example/vendor/symfony/src/Symfony/Component/ClassLoader/DebugUniversalClassLoader.php:55
  </code></pre>
  
  <p>My app was using MySQL but I want to evaluate mongodb.</p>