I received rejection 'Inv Trip Party ACE ID'. What does it mean?

I received rejection 'Inv Trip Party ACE ID'. What does it mean?

Reason:
The submitted manifest contains an invalid ACE ID, which could be associated with the truck, trailer, or crew.
Resolution:
Check the information for the driver, trailer, and truck. If one of these is using an ACE ID, perform the following:

For conveyance/truck:
1.       Remove conveyance/truck ACE ID.
2.       Save the manifest.
3.       Resubmit as ADD.

For equipment/trailer:
1.       Remove equipment/trailer ACE ID.
2.       Save the manifest.
3.       Resubmit as ADD.

For Driver:
1.       Verify if the driver has both a FAST card and an ACE ID. If the driver has a FAST card, use that.
2.       If the driver doesn’t have a FAST card, check if the ACE ID # used is correct.
3.       If the ACE ID # is correct, resubmit as ADD.