Unable to connect to database.

A database error occurred while processing this request.

Catchable fatal error: Argument 1 passed to ConfigStore::__construct() must be an instance of Database, null given, called in /var/www/grocers/co20130304/updates/concrete5.4.2.2/concrete/models/config.php on line 48 and defined in /var/www/grocers/co20130304/updates/concrete5.4.2.2/concrete/models/config.php on line 136