xnets not generated properly

First thing to check with xnet generation is the models create/assigned to the discrete devices - make sure the Res Pack has a espice model assigned to it. Res Pack models do not get created automatically when using the auto setup or auto generate button (back-end or front-end), so they need to be created seperately.

make sure the Res Pack is of CLASS = DISCRETE, and the pins are PIN_TYPE=UNSPEC

so how do I choose or create an espice model for my resistor packs?

I think I figure it out.
This is a sample of my resistor pack model.

("RESNETX4_RNX4_68_68"
("ESpice"
".subckt RESNETX4_RNX4_68_68 1 2 3 4 5 6 7 8
R1 1 2 68
R2 3 4 68
R3 5 6 68
R4 7 8 68
.ends RESNETX4_RNX4_68_68
")
("PinConnections"
("1" "2")
("2" "1")
("3" "4")
("4" "3")
("5" "6")
("6" "5")
("7" "8")
("8" "7")
)
)

I guess you are using Allegro PCB and not DEHDL (schematic)?

Easiest way to create a Espice model for the Res Packs in Allegro PCB is to to use:-

Analyze->SI/EMI Sim->Model (if using XL or SI Model Setup from Tools->Setup Advisor)
Click on RefDes Pins tab
Find the Res Pack and select it
Click on Create Model and create a Espice model

I tried that, but then when I looked at the output I realized that something went wrong.
What it did it created all the possible combination on the resistor pack. I just needed the combinations like 1-2 and 2-1. I don't know if that makes sense. Either way thanks for your help.