Bug Animation Rigging is not working

When I click play, Console shows this error:

InvalidOperationException: The TransformStreamHandle cannot be resolved.
UnityEngine.Animations.TransformStreamHandle.CheckIsValidAndResolve (UnityEngine.Animations.AnimationStream& stream) (at <ad0a7939819048a0a161f66558c98867>:0)
UnityEngine.Animations.TransformStreamHandle.SetLocalTRS (UnityEngine.Animations.AnimationStream stream, UnityEngine.Vector3 position, UnityEngine.Quaternion rotation, UnityEngine.Vector3 scale, System.Boolean useMask) (at <ad0a7939819048a0a161f66558c98867>:0)
UnityEngine.Animations.Rigging.RigSyncSceneToStreamJob+TransformSyncer.Sync (UnityEngine.Animations.AnimationStream& stream) (at Library/PackageCache/com.unity.animation.rigging@1.0.3/Runtime/AnimationJobs/RigSyncSceneToStreamJob.cs:49)
UnityEngine.Animations.Rigging.RigSyncSceneToStreamJob.ProcessAnimation (UnityEngine.Animations.AnimationStream stream) (at Library/PackageCache/com.unity.animation.rigging@1.0.3/Runtime/AnimationJobs/RigSyncSceneToStreamJob.cs:117)
UnityEngine.Animations.ProcessAnimationJobStruct`1[T].Execute (T& data, System.IntPtr animationStreamPtr, System.IntPtr methodIndex, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at <ad0a7939819048a0a161f66558c98867>:0)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr, Boolean&)






Here is The Right Hand IK

it is also showing :Could not resolve 'Player1/MP7' because it is not a child Transform in the Animator hierarchy.
Could not resolve 'Player1/Rig Layer/Right_HandIK' because it is not a child Transform in the Animator hierarchy.
Could not resolve 'Player1/Rig Layer' because it is not a child Transform in the Animator
hierarchy.




What should I do???

 

for me this happened because i had a nested prefab in the heirarchy. jobs didn't like it i guess. Think back to the latest thing you added to the main object, and try to use less nested prefabs. It baffled me that this happened, but it made my rigs work again. If you remove the rig component, your stuff will work. If you leave it on, you have to find the nested prefab the animation rigging component doesn't like.