Doctrine\ODM\MongoDB\MongoDBException::failedToEnableSharding PHP Method

    public static function failedToEnableSharding($dbName, $errorMessage)
    {
        return new self(sprintf('Failed to enable sharding for database "%s". Error from MongoDB: %s', $dbName, $errorMessage));
    }

 /**
  * Enable sharding for database which contains documents with given name.
  *
  * @param string $documentName
  *
  * @throws MongoDBException
  */
 public function enableShardingForDbByDocumentName($documentName)
 {
     $dbName = $this->dm->getDocumentDatabase($documentName)->getName();
     $adminDb = $this->dm->getConnection()->selectDatabase('admin');
     $result = $adminDb->command(array('enableSharding' => $dbName));
     if ($result['ok'] != 1 && $result['errmsg'] !== 'already enabled') {
         throw MongoDBException::failedToEnableSharding($dbName, $result['errmsg']);
     }
 }