Rectenna simulation for Rf energy harvesting on ADS

i am making an Rf energy harvesting circuit using ADS working on 3 bands 1.8GHZ , 2.1GHZ and 2.4 GHZ and i m getting the Vout very low around 0.002v and i m getting this message during the simulation and i couldnt know whats the problem i have or what i need to add or check can you please help me to check my circuit of i need to add or fix something

##Warning detected by hpeesofsim during DC analysis `HB1'.
Matrix is singular (detected at node or branch `L2.i').
Warning detected by hpeesofsim during DC analysis `HB1'.
Circuit converged after a virtual resistance of 1 TOhms
was added between each node and ground, and a virtual
resistance of 1 pOhms was inserted in each current branch.
Possible causes include floating nodes or missing ground.
Warning detected by hpeesofsim during HB analysis `HB1'.
More than one mixing term has landed on frequency 300 MHz.
Warning detected by hpeesofsim during HB analysis `HB1'.
More than one mixing term has landed on frequency 2.1 GHz.

L1, L4, L2, L5, L3 and L6 consitute rigid loop.
So it can not determine DC operation point.

Set small R for inductor or insert dc-cut for L1, L2 and L3.

f1=1800MHz=6*300MHz
f2=2100MHz=7*300MHz
f3=2400MHz=8*300MHz

Fundamental Freqquency=300MHz.

f2-f1=300MHz
f3-f2=300MHz
f3-(f2-f1)=2100MHz

Set f3=2401MHz.

BTW, why do you set all orders as 1 ?
Can you understand HB Analysis ?

thank you for your answer yeah i put small resistance in L1 ,L2 and L3 and its correct now i didnt get the that massage i changed also the third frequency but really i am new in ADS so i dont have that much idea for HB analysis but can i ask you please about the output voltage that i have

What is your question ?

i m trying to get higher voltage but like is shown in the image i m having very low output voltage but i wanna ask also when we hare having 0 hz frequency it written that 2.350 V the output voltage what does that mean ??