How to do Verilog/VerilogA co-simulation , using cadence ams ?

How to do the ams simulation , using verilog + verilogA ?

Now My top cell is verilog file, in which the analog sub-module is instantiated.

1. The analog sub-module is SPICE netlist.
I can run the ams simulation.
The amsd block is :
include "./source/ana_cell.spi" ( SPICE netlist file )
amsd {
ie vsup=1.8
portmap subckt=ana_cell
config cell=ana_cell use=spice
}

2. The analog sub-module is verilogA file .

My amsd block is :
ahdl_include "./source/ana_cell.va" ( VerilogA file )
amsd {
ie vsup=1.8
}

Then the simulator always give me an error :
" Could not determine discipline for xx.xx.xx "

how to create the right amsd block ?

Urgent!

Anyone can help me ?
Urgent!