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NullReferenceException: Object reference not set to an instance of an object
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MissingReferenceException: The object of type 'GameObject' has been destroyed but you are still trying to access it.
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IndexOutOfRangeException: Index was outside the bounds of the array.
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StackOverflowException (Unity がクラッシュすることもある)
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error CS0246: The type or namespace name 'XXX' could not be found (are you missing a using directive or an assembly reference?)
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