AssertionException: The sides from input vectors are parallel.

[NAOLIU]

AssertionException: The sides from input vectors are parallel.
Assertion failure. Values are equal.
Expected: (0.00, 0.00, 0.00) != (0.00, 0.00, 0.00)
UnityEngine.Assertions.Assert.Fail (System.String message, System.String userMessage) (at <7b964b5504bc41fc86a86b55a1627f10>:0)
UnityEngine.Assertions.Assert.AreNotEqual[T] (T expected, T actual, System.String message, System.Collections.Generic.IEqualityComparer`1[T] comparer) (at <7b964b5504bc41fc86a86b55a1627f10>:0)
UnityEngine.Assertions.Assert.AreNotEqual[T] (T expected, T actual, System.String message) (at <7b964b5504bc41fc86a86b55a1627f10>:0)
SeedUnityVRKit.ModelAnimator.GetNormal (UnityEngine.Vector3 a, UnityEngine.Vector3 b, UnityEngine.Vector3 c) (at Assets/Scripts/Animator/ModelAnimator.cs:179)
SeedUnityVRKit.ModelAnimator.Update () (at Assets/Scripts/Animator/ModelAnimator.cs:119)