In ConnectionFactory.php line 134:

[songarevijay]

An exception occurred while establishing a connection to figure out your platform version.
You can circumvent this by setting a 'server_version' configuration value

For further information have a look at:
doctrine/DoctrineBundle#673

In AbstractMySQLDriver.php line 128:

An exception occurred in driver: could not find driver

In Exception.php line 18:

could not find driver

In PDOConnection.php line 39:

could not find driver