I received rejection 'W64: Primary CCN-Carrier cannot be a Freight Forwarder'. What does it mean?

I received rejection 'W64: Primary CCN-Carrier cannot be a Freight Forwarder'. What does it mean?

Reason: Used 8000 series code on the Primary CCN

Resolution: Correct the carrier code to a valid Carrier's carrier code (ex. 9000 series for marine carrier and IATA for air carrier) and resubmit as Change.