This error can sometimes occur if a blank product group has been created.
Please check Product Groups within Inventory to ensure no blank named product groups have been created.
If a blank named product group has been created, please reassign any SKUS in that group and then contact support to delete the group.
Please try refreshing the settlement via the Action menu on your settlement:
If the refresh then does not clear the error, or the error is not due to a blank product group, please contact our support team.

