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Multi-parent constraint not working - System.InvalidOperationException: The TransformStreamHandle is invalid. Please use proper function to create the handle.
I am trying to use a multi-parent constraint with my animations in timeline but nothing is constraining. Every time I get this error -
Thrown from job:System.InvalidOperationException: The TransformStreamHandle is invalid. Please use proper function to create the handle.
UnityEngine.Animations.Rigging.MultiParentConstraintJob
I am using a Humanoid imported rig in Unity 2019.4.18f1. The rig builder is set on the parent node with the rig under it and an empty node that has the multi parent nested under the rig generated by animation rigging. Inside the multi parent I have a separate game object as the constrained and both hands of my rig set as the source objects. Everything has an animator assigned with no controller or avatar attached except for the parent of the character.