How can I use the "Vspectrans" simulator in ADS?

[Yasmeen Sanad]

I want to get the spectrum form of a VCO at frequency 2.4GHz.
I am using the "Vspectran" simulator on ADS but every time it gives me an error "Evaluation failed for the Vspectran 1"
I defined Vspectran1 as follows:

Vspectran (Vout1-Vout1,0,2.4GHz,8)

Anyone knows how can I resolve this or use the simulator???

Added after 1 minutes:

this smiley is supposed to be an " 8 "

 

[khouly]

use it as follows

Vspectran (Vout1-Vout2,0,100MHz,40)

this will get the spectrum in 100 Mhz step to 4 GHz which is 40*100MHz

khouly