ID:186164 Can't place GXB transmitter or receiver channel "<name>" to location <name> because the channel is already assigned to location <name>

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 the channel is already assigned to another location.

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