Atal error: Interface 'Piwik_Db_Adapter_Interface

Can anyone help me with this error message

The message appears when doing a http://www.gigajobs.com.au/piwik/index.php?action=systemCheck

Fatal error: Interface ‘Piwik_Db_Adapter_Interface’ not found in /home/gigsjobs/gigajobs.com.au/piwik/core/Db/Adapter/Pdo/Mssql.php on line 254

As I am a newb at piwik and don’t understand why its coming up

Maybe this is an upload problem? please make sure all files are uploaded properly