Fatal error: Call to a member function rollBack() on a non-object in /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/pdo/connection.php on line 353

Fatal error: Uncaught exception 'PDOException' with message 'invalid data source name' in /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/pdo/connection.php:89
Stack trace:
#0 /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/pdo/connection.php(89): PDO->__construct('', NULL, NULL, Array)
#1 /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/pdo/connection.php(316): Fuel\Core\Database_PDO_Connection->connect()
#2 /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/connection.php(488): Fuel\Core\Database_PDO_Connection->escape('5c43c5bd277105b...')
#3 [internal function]: Fuel\Core\Database_Connection->quote('5c43c5bd277105b...')
#4 /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/query/builder/insert.php(168): array_map(Array, Array)
#5 /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/query.php(228): Fuel\Core\Database_Query_Builder_Insert->compile(Object(Fuel\Core\Database_PDO_Connection))
#6 /var/www/virtua in /var/www/virtual/gigabaito/html/gigabaito/fuel/core/classes/database/pdo/connection.php on line 94