Hi,

I have been trying to do AMS simulation with different type of Instances (verilog, verilogA , pdk created Schematic symbol) together.

I am getting some errors and warnings which I cannot understand. The error is for the pdk nmos_b and pmos_b and even for rmres_b and others where components with _b is instantiated.

The log looks like this :-

ncelab(64): 15.20-s017: (c) Copyright 1995-2016 Cadence Design Systems, Inc.
Elaborating the design hierarchy:
ncelab: *W,CUNOUN: Cannot find any unit under XXXXX.nfet_b:symbol in the design libraries.
ncelab: *W,DLLSVW: Unable to list the views of rfLib.rfLib (System error).
ncelab: *W,DLLSVW: Unable to list the views of rfLib.log (System error).
ncelab: *E,CUCFUN: instance 'N0' of the unit 'nfet_b' is unresolved in 'mmsim.inverter_analog:schematic'.
ncelab: *W,CUNOUN: Cannot find any unit under XXXXX.pfet_b:symbol in the design libraries.
ncelab: *E,CUCFUN: instance 'P0' of the unit 'pfet_b' is unresolved in 'mmsim.inverter_analog:schematic'.
ncelab: *W,CUNOUN: Cannot find any unit under XXXXX.nfet_b:symbol in the design libraries.
ncelab: *E,CUCFUN: instance 'N0' of the unit 'nfet_b' is unresolved in 'mmsim.buffer_analog:schematic'.
ncelab: *W,CUNOUN: Cannot find any unit under XXXXX.pfet_b:symbol in the design libraries.
ncelab: *E,CUCFUN: instance 'P0' of the unit 'pfet_b' is unresolved in 'mmsim.buffer_analog:schematic'.
ncelab: Memory Usage - 49.8M program + 35.3M data = 85.1M total (Peak 85.1M)
ncelab: CPU Usage - 0.4s system + 0.8s user = 1.2s total (5.5s, 21.7% cpu)
Failed to elaborate ("mmsim" "hierarchy_test" "config").

XXXXX is pdk technology library name.
I am not worried about warnings. I need help with errors, and want to know why should _b bother me.