Ok Samurai Walker-Rigging Issues--Right Pupil - Layer tagged as right pupil size is not being use by

I downloaded the Walker puppet from Ok Samurai to study the combination of walking and head turning behaviors and in the Rigging Issues control panel I keep getting a long list of Right Pupil - Layer tagged as right pupil size is not being use by any behaviors.

I did not change anything in the walker in this issue came up from the original file. Does anyone know what this rigging issue means and how to fix it?