We need more information. Is this a standard list? Are you using SharePoint interface to edit the item (or) is it through a workflow? Any errors in the K2 HostServer logs

Hi

It's a standard list, and I want the workflow to update the status as it moves through the process e.g. Pending Approved, Approved etc..  I haven't deployed as yet and I can't see any errors.

Thank you.

usually you get this error if you are trying to update a list item with a wrong ID.