Re: Serenade SV- Error \\\ ==> Undefined label: 0POR.
Serenade is not SPICE simulator but RF simulator.
Replace the voltage source with a microwave port
and then run an analysis. After that you can view
the frequency response of your circuit - view the
S parameter response, VSWR, Z, Y parameters ...
As your voltage divider is frequency independent
the responses will be straight lines.
Try to add some frequency dependent component e.g.
a capacitor, inductor, transmission line...
To have a quicker start open the examples directory
and simulate some projects from it. There are also
3-4 tutorials, but they are a bit complicated.