Hi, I am trying to export an animation, that I made in Unity. I tried exporting the gameObject, that uses the animation but I got this error :
ArgumentNullException: Value cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <fb001e01371b4adca20013e0ac763896>:0) System.Collections.Generic.Dictionary2[TKey,TValue].set_Item (TKey key, TValue value) (at :0)
UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportSkeleton (UnityEngine.SkinnedMeshRenderer skinnedMesh, Autodesk.Fbx.FbxScene fbxScene, System.Collections.Generic.Dictionary2[UnityEngine.SkinnedMeshRenderer,UnityEngine.Transform[ ]]& skinnedMeshToBonesMap) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:1044) UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportSkinnedMesh (UnityEngine.GameObject unityGo, Autodesk.Fbx.FbxScene fbxScene, Autodesk.Fbx.FbxNode fbxNode) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:952) UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportMesh (UnityEngine.GameObject gameObject, Autodesk.Fbx.FbxNode fbxNode) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:4195) UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportComponents (Autodesk.Fbx.FbxScene fbxScene) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:3265) UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportAll (System.Collections.Generic.IEnumerable1[T] unityExportSet, System.Collections.Generic.Dictionary2[TKey,TValue] exportData) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:3594) UnityEditor.Formats.Fbx.Exporter.ModelExporter.ExportObjects (System.String filePath, UnityEngine.Object[ ] objects, UnityEditor.Formats.Fbx.Exporter.IExportOptions exportOptions, System.Collections.Generic.Dictionary2[TKey,TValue] exportData) (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/FbxExporter.cs:4324)
UnityEditor.Formats.Fbx.Exporter.ExportModelEditorWindow.Export () (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/ExportModelEditorWindow.cs:643)
UnityEditor.Formats.Fbx.Exporter.ExportOptionsEditorWindow.OnGUI () (at Library/PackageCache/com.unity.formats.fbx@3.2.0-preview.2/Editor/ExportModelEditorWindow.cs:444)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at :0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at :0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[ ] parameters) (at :0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /home/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:381)
UnityEditor.HostView.Invoke (System.String methodName) (at /home/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:375)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at /home/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:351)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at /home/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:406)
UnityEditor.DockArea.OldOnGUI () (at /home/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:395)
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 /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:293)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:508)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:491)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:484)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus) (at /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:477)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at /home/builduser/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:449)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at /home/builduser/buildslave/unity/build/Modules/UIElements/Events/EventHandler.cs:77)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /home/builduser/buildslave/unity/build/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:92)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:310)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:275)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:238)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:203)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:44)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:301)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at /home/builduser/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:159)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at /home/builduser/buildslave/unity/build/Modules/UIElements/Panel.cs:257)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at /home/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.bindings.cs:404)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /home/builduser/buildslave/unity/build/Modules/UIElements/UIElementsUtility.bindings.cs:194)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /home/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:197)
What can I do to fix this?