I have configured a GXB transceiver to RX Simplex. But I get an error message in Quartus 18.1 pro related to duplex channel cluster constraints

I have configured a GXB transceiver to be RX Simplex. I get the next error message in Quartus 18.1 Pro Error(14566): The Fitter cannot place 4 periphery component(s) due to conflicts with existing c...