@Kevin_R 

You are having trouble because there is not a neutral in your wiring.

The two whites in the first photo is a pass through of the white common/line in the second photo

@B.Will Thank you for the input. Is there any way I can rewire the sitches to make the HS210 work?

@Kevin_R 

Sorry no.

I can see in the first picture that there are 2 grounds, that tells me there is not a third cable with a neutral.

@Kevin_R 

I ran into the same problem as you yesterday, and looks like our wiring should be the same and just like this in the below diagram.

In my case, luckily, the 3 wire cable between 2 switchs in the above diagram is running close by the Light Fixture, and I can cut it, and recabling it to the diagram below. 

(I also need to connect the To Panel (power Source) to the 2-wire cable from the above diagram, so that, the power source go the switch first.) 

and replaced the switch on the left side above to a HS210,

Then it works perfectly.

option 2 is you can find a power source close by the switch on the right hand sided in the below diagram, or run a new 2-wire cable from the penal to that switch.

and removed the cable (or install a outlet on the ceiling or in the attic) from the penal in the below diagram

Then you can turn your wiring as below.

and replacing the switch on the left hand side in the above diagram with a HS210, that should works too.

In Summary,
When Power source run to the light fixture first, then HS210 will never work.

Credit to: http://www.electrical101.com/3way-switch-wiring-using-nm-cable.html