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The `empty` method was renamed to `is_empty` somewhere between 3.x and 4.x so the code in the tutorial just needed to be brought up to date. This was brought to light by someone in the Godot server on the #beginner-2 channel noticing an error when running that code: https://discord.com/channels/212250894228652034/762480166248513577/1218050947385786438