Bug POSSIBLE BUG? Animation rigging and avatar masks - 2019.4.20

I have been using animation rigging on a character of mine, and it worked perfectly up until I needed to use avatar masks to animate the character running and reloading simultaneously.

When I seperated the animator into layers, and assigned the masks, the animation rigging broke and the aim constraints are no longer pointing at the desired transform.

I am getting this error:
System.InvalidOperationException: The TransformStreamHandle cannot be resolved.
Thrown from job: UnityEngine.Animations.Rigging.MultiAimConstraintJob

but when I researched it nothing came up that matched my situation.

my avatar is NOT humanoid