title: Install the DoctrineMongoDBBundle with Composer
body: <p>I have been trying to install DoctrineMongoDBBundle with Symfony2. I followed this reference <a href="http://symfony.com/doc/current/bundles/DoctrineMongoDBBundle/index.html" rel="nofollow">http://symfony.com/doc/current/bundles/DoctrineMongoDBBundle/index.html</a> </p>
  
  <p>Unfortunately I am getting the following error and could not find a solution.
  I have already added the php extension for MongoDB. Could you please give an idea about this ?</p>
  
  <ul>
  <li>doctrine/mongodb 1.0.3 requires ext-mongo >=1.2.12,&lt;1.5-dev -> the request
  ed PHP extension mongo has the wrong version (1.2.11) installed.
  <ul>
  <li>doctrine/mongodb 1.0.2 requires ext-mongo >=1.2.12,&lt;1.4-dev -> the request
  ed PHP extension mongo has the wrong version (1.2.11) installed.</li>
  <li>doctrine/mongodb 1.0.1 requires ext-mongo >=1.2.12,&lt;1.4-dev -> the request
  ed PHP extension mongo has the wrong version (1.2.11) installed.</li>
  <li>doctrine/mongodb 1.0.0 requires ext-mongo >=1.2.12,&lt;1.4-dev -> the request
  ed PHP extension mongo has the wrong version (1.2.11) installed.</li>
  <li>doctrine/mongodb-odm 1.0.0-BETA5 requires doctrine/mongodb 1.0.0-BETA1 ->
  no matching package found.</li>
  </ul></li>
  </ul>