Multisim sofware simulation help

Hello everyone,,

I am new to electronics and I need your help
with a simulation using multisim.

I have attached them for your viewing.

I keep getting ckt is empty when I try simulating and I was wondering if anyone would be able to
tell me what I'm doing wrong. I have already posted this message on multisim forum
but haven't had a reply yet.

the 1st attachment is the error message, 2nd is the circuit I constructed, third is the simplification used in constructing
the ckt.

Hope you good people are able to help.

thanks