ID:186090 Can't place differential I/O "<name>" pin "<name>" that requires a dedicated SERDES in location <name> which does not have a differential I/O <name> SERDES available

CAUSE: The Fitter cannot place the specified differential I/O pin that requires a dedicated I/O SERDES to the specified location because that location does not have a SERDES of that kind available.

ACTION: Delete or change the location assignment for the pin.