What does this error mean ?

Unity Engine
1

What does this error mean ? It suddenly appeared in my console.

AnimationModeSnapshot.AddPropertyModification may only be called in animation mode.
UnityEditor.AnimationMode:AddPropertyModification(EditorCurveBinding, PropertyModification, Boolean)
UnityEditorInternal.AnimationRecording : Process(AnimationWindowState, UndoPropertyModification) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationRecording.cs:64)
UnityEditorInternal.AnimationWindowState : PostprocessAnimationRecordingModifications(UndoPropertyModification) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowState.cs:1199)
UnityEditor.Undo:InvokePostprocessModifications(UndoPropertyModification)

2

unity seems to be stuck in recording the animation, even though i pressed the button to stop the animation recording.

my workaround for this issue currently is to start and stop the game, so unity will not record it anymore.

see also this thread