Got NullReferenceException when try to export vrm 0.x

[kassiyaaa]

Environments (please complete the following information):

• UniVRM version: UniVRM-0.121.0_640f
• Unity version: Unity-2022.3.6f
• OS: Windows 11

what should i do?

Describe the bug

NullReferenceException: Object reference not set to an instance of an object
UniGLTF.MeshUtility.MeshAttachInfo+<>c__DisplayClass4_0.b__0 (UnityEngine.Transform x) (at Assets/UniGLTF/Runtime/MeshUtility/MeshAttachInfo.cs:23)
System.Linq.Enumerable+SelectArrayIterator2[TSource,TResult].ToArray () (at <de4a1a1490a74771a34fee0d1d586658>:0) System.Linq.Enumerable.ToArray[TSource] (System.Collections.Generic.IEnumerable1[T] source) (at :0)
UniGLTF.MeshUtility.MeshAttachInfo.ReplaceMesh (UnityEngine.GameObject dst) (at Assets/UniGLTF/Runtime/MeshUtility/MeshAttachInfo.cs:23)
UniGLTF.MeshUtility.BoneNormalizer.Replace (UnityEngine.GameObject go, System.Collections.Generic.Dictionary2[TKey,TValue] meshMap, System.Boolean FreezeRotation, System.Boolean FreezeScaling) (at Assets/UniGLTF/Runtime/MeshUtility/BoneNormalizer.cs:101) VRM.VRMBoneNormalizer.Execute (UnityEngine.GameObject go, System.Boolean forceTPose) (at Assets/VRM/Runtime/SkinnedMeshUtility/VRMBoneNormalizer.cs:85) VRM.VRMEditorExporter.Export (UnityEngine.GameObject exportRoot, VRM.VRMMetaObject meta, VRM.VRMExportSettings settings, System.Collections.Generic.List1[T] destroy) (at Assets/VRM/Editor/Format/VRMEditorExporter.cs:205)
VRM.VRMEditorExporter.Export (UnityEngine.GameObject exportRoot, VRM.VRMMetaObject meta, VRM.VRMExportSettings settings) (at Assets/VRM/Editor/Format/VRMEditorExporter.cs:25)
VRM.VRMExporterWizard.ExportPath (System.String path) (at Assets/VRM/Editor/Format/VRMExporterWizard.cs:264)
UniGLTF.ExportDialogBase.EndGUI () (at Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs:162)
UniGLTF.ExportDialogBase.OnGUI () (at Assets/UniGLTF/Editor/UniGLTF/ExportDialog/ExportDialogBase.cs:82)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at <347e3e2bef8c4deb82c9790c6e198135>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect dockAreaRect) (at <347e3e2bef8c4deb82c9790c6e198135>:0)
UnityEditor.DockArea.OldOnGUI () (at <347e3e2bef8c4deb82c9790c6e198135>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at :0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at :0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at :0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at :0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at :0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at :0)
UnityEngine.UIElements.IMGUIContainer.ProcessEvent (UnityEngine.UIElements.EventBase evt) (at :0)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at :0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtCurrentTargetAndPhase (UnityEngine.UIElements.EventBase evt) (at :0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at :0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at :0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at :0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at :0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at :0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at :0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at :0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at :0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at :0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at :0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at :0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at :0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at :0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at :0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <4397ca26b8a24183a25a95ffae967e39>:0)

[ousttrue]

The ones used for skinning (bones in SkinnedMeshRenderer.bones, bones with boneWeight, etc.) are
Please do not delete it.