SAP Message V6566 - No shipment exists for external ID1 & and forwarding agent &

Diagnosis
You have attempted to refer to an existing shipment. Using thereference parameters of the IDoc (E1TPSHH-SRVID1 = <(>&<)>V1 &,E1TPSHH-CARRID = <(>&<)>V2&), however, the system could not find anyshipment.

System Response
Processing terminated.