Warning: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php on line 40

Fatal error: Uncaught exception 'RuntimeException' with message 'Failed to start the session because headers have already been sent by "/var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php" at line 40.' in /var/www/html/app/cache/prod/classes.php:103 Stack trace: #0 /var/www/html/app/cache/prod/classes.php(183): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() #1 /var/www/html/app/cache/prod/classes.php(479): Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->getBag('attributes') #2 /var/www/html/app/cache/prod/classes.php(18682): Symfony\Component\HttpFoundation\Session\Session->get('sonata/page/isE...', false) #3 /var/www/html/app/cache/prod/classes.php(18673): Sonata\PageBundle\CmsManager\CmsManagerSelector->isEditor() #4 /var/www/html/app/cache/prod/classes.php(21029): Sonata\PageBundle\CmsManager\CmsManagerSelector->retrieve() #5 /var/www/html/app/cache/prod/classes.php(21009): Sonata\PageBundle\Listener\ExceptionListener->handleNativeError(Ob in /var/www/html/app/cache/prod/classes.php on line 103