ID:178003 Could not find duplex location to place duplex channel consisting of <name> and <name>

CAUSE: The Fitter could not place the specified blocks in such a way that duplex channel requirements between these blocks could be satisfied. This message may appear because one or more of the specified blocks have location or region constraints that make it impossible to satisfy the duplex channel requirement.

ACTION: If you made a location assignment to the specified blocks, remove the assignment if possible. If this does not result in a successful fit, compile the design targeting a larger device.