ID:186167 Can't place GXB transmitter or receiver channel "<name>" to location <name> because the location is already occupied by another channel

CAUSE: You included the specified gigabit transceiver block (GXB) transmitter or receiver channel in the current design. However, the Fitter cannot place the GXB transmitter or receiver channel at the specified location because another channel is already assigned to that location.

ACTION: Assign the GXB transmitter or receiver channel to a different location.