ID:186359 Can't place system clock pin "<name>" referencing DQS I/O pin(s)

CAUSE: The Fitter cannot place the specified system clock pin on the same side of the device as the DQS I/O pins driven by it. The PLLs or dedicated clock pins on that side of the device are already occupied.

ACTION: Change the location assignments of other pins to make room for the DQS I/O system clock pin.