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Fixed in Next 2021.2/1.6 release, 1.5.7



Found in [Package]


Issue ID




MissingReferenceException is thrown when using RigBuilder inside a Prefab.

Package: Timeline


How to reproduce:
1. Open the attached "" project
2. Double click on the RootPrefab Timeline asset in the Assets folder
3. Double click on the RootPrefab prefab asset in the Assets folder
4. Go back to the scene
5. Click on the Console

Expected result: No errors
Actual result: MissingReferenceException is thrown

Reproducible with: 1.0.3 (2020.3.20f1, 2021.1.25f1), 1.1.1 (2021.2.0b15, 2022.1.0a12)
Couldn't test: 2019.4.31f1 (Package errors)

* Original Bug from forums:
* When downgrading from 2021.2 or 2022.1 into 2021.1 or lower, you might encounter an error with a missing package
* To fix the missing package issue just remove com.unity.feature.characters-animation from the project, then download the Animation Rigging package

Comments (1)

  1. akent99

    Oct 07, 2021 17:35

    In case helpful, I took my full project (not the one uploaded), selected "Prefab > Unpack completely" on the characters using the animation rigging (so the character with animation rigging was no longer a prefab) and still got errors in the console.

    NullReferenceException: Object reference not set to an instance of an object
    UnityEngine.Animations.Rigging.RigBuilder.UpdatePreviewGraph (UnityEngine.Playables.PlayableGraph graph) (at Library/PackageCache/com.unity.animation.rigging@1.1.1/Runtime/AnimationRig/RigBuilder.cs:178)
    UnityEngine.Timeline.AnimationPreviewUpdateCallback.Evaluate () (at Library/PackageCache/com.unity.timeline@1.6.2/Runtime/Animation/AnimationPreviewUpdateCallback.cs:40)
    UnityEngine.Timeline.TimelinePlayable.Evaluate (UnityEngine.Playables.Playable playable, UnityEngine.Playables.FrameData frameData) (at Library/PackageCache/com.unity.timeline@1.6.2/Runtime/TimelinePlayable.cs:288)
    UnityEngine.Timeline.TimelinePlayable.PrepareFrame (UnityEngine.Playables.Playable playable, UnityEngine.Playables.FrameData info) (at Library/PackageCache/com.unity.timeline@1.6.2/Runtime/TimelinePlayable.cs:249)
    UnityEngine.Timeline.DirectorControlPlayable:ProcessFrame(Playable, FrameData, Object) (at Library/PackageCache/com.unity.timeline@1.6.2/Runtime/Playables/DirectorControlPlayable.cs:123)

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