Fix for anyone getting the invalid editor window

Go to Window > Layouts > Reset all layouts and the idle animation should work now.

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Received this today when I chose Maximize for my Game window and had it docked to the right of my Scene view. Moved my Game window to dock at the top and it also resolved the issue. Even though it was a critical (red) error, it did not affect compiling of code. See below link which explains problem and fix in detail:

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