Simulating MOS Varactor

Hello,

I would like to simulate the MOS Varactor to determine Capacitance versus frequency. 

I looked through the forum and found old posts but It is not working for me.

https://community.cadence.com/cadence_technology_forums/f/rf-design/40895/multiple-y-param-results-for-varactor

I am attaching my test bench. 

Thank you so much in advance.