ArriaV ALTIOBUF bidirectional diffrential

I am using ArriaV 5ASTFD5K3F40I3 and I'm having an error regarding MEGAFUNCTION: ALTIOBUF (bidir) and I used SSTL-18 CLASSI. It says:

Error (21168): Bidirectional pin XbFbStbA0 with a pseudo-differential I/O standard must use the OEIN port of the node...

... In our Verilog rtl code

simple_iobuf_bidir_dif uXbFbStbA0

(

//Inputs

.datain (boFbStbA0),,

.oe (|oeboFbDataA0),

//Outputs

.dataout (|oecoFbDataA0),

//Inouts

.dataio (XbFbStbA0), //positive

.dataio_b (XbFbStbA0L) //negative

);

i also assigned:

XbFbStbA0 to PIN_C23 //DQS2T (special function)

XbFbStbA0L to PIN_D23 //DQSn2T (special function)

can anyone help me on this.

Thank You!