ID:176499 Can't place DQS I/O pin "<name>" in location <name> -- DQS I/O pin requires DQSMUX resource location that is occupied by a different DQS I/O pin

CAUSE: The Fitter cannot place the specified DQS I/O pin in the specified location because the DQSMUX resource required by the specified DQS I/O pin is already occupied by a different 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. If you did not make a location assignment, the specified location represents the last location in which the Fitter attempted to place the specified DQS I/O pin.

ACTION: If you made a location assignment to the specified DQS I/O pin, remove the assignment if possible. Otherwise, remove the location assignments to the DQ I/O pins or the nDQS I/O pins associated with the specified DQS I/O pin. If this does not result in a successful fit, compile the design targeting a larger device.