ID:176503 Can't place DQS I/O pin "<name>" in location <name> -- location is already occupied by DQS I/O pin "<name>"

CAUSE: The Fitter cannot place the specified DQS I/O pin the specified location because that location is already occupied by the second specified DQS I/O pin. You may have made location assignments which resulted in the Fitter attempting to place the DQS I/O pin in the specified location.

ACTION: If you made location assignments to the specified DQS I/O pin or its DQ I/O pins, remove them or remove location assignments to other I/O pins in the design. If this does not result in a successful fit, compile the design targeting a larger device.