ID:18021 Primitive "<name>" of type <type> cannot feed CASCADE primitive "<name>" because the primitive already contains fan-out to one or more CASCADE primitives

CAUSE: The specified primitive cannot fan out to the specified CASCADE primitive because it fans out to one or more CASCADE primitives.

ACTION: Modify the design so that the specified primitive fans out to only one CASCADE primitive by removing all but one CASCADE output from the specified primitive and deleting the remaining CASCADE primitives.