i am using IBM 0.13 um PDK and hspice

 **warning**  in element= 42:cwiredb          defined in subckt nfet            
 capacitance =    0.00     <= 0 farad, please verify it.

Warning: Pd = 2.75e-07 is less than W.
Model:   42:nfet
W = 3.2e-07, L = 1.2e-07

I keep getting such warnings on the elements of my subcircuit when I run my simulations. I checked my circuit and verified that PD >W.

I am assuming cwiredb refers to capacitance between drain and body. the body of my nfet is connected to ground, and drain is the output. they are totally not connected together. i have no idea why capacitance would turn out to be 0.

i am suspecting that while the model is being formed, some errors are occuring, and the simulator is trying to create a model which is different from what I am trying to create.