Cyclic Dependencies in an AR coating

Hi all,

I am currently working on modeling an antireflection coating by building a model based off of the Plasmonic Wire Grating tutorial. I have attached the model, so I'll skip over the particulars of how its built. Every time I try to solve, the model generates an error -
"There are cyclic dependencies.
- Variable name: root.comp1.mat12.rfi.n11
Error in multiphysics compilation."

Anyone know what is going on?