my RP GUI script doesn't work? it keeps coming up with this error.

it says current identy (2) can't define characters name (requires 4)

player = game.Players.LocalPlayer
script.Parent.MouseButton1Click:connect(function()
	player.Character.Name = script.Parent.Parent.TextBox.Text
end)

why does it do that shouldn't it just change the model name it's a gui where you type in a text box press a text button and the script runs but when you press the button the error comes up.