How do i change the position of the mouse cursor?

Hello, i am making this gui that has a selector that changes it's rotation based on the mouse position (I did not make that script, the person i am working with made that.)

I am trying to script it so that the mouse position is at the middle of the screen.

This is my current script:

local mouse = plr:GetMouse()
InputService.InputBegan:Connect(function(key, chat)
	if chat then return end
	if key.KeyCode == Enum.KeyCode.T then
		mouse.X = 0
		mouse.Y = 0
	end
end)

However, whenever i test the script out the log says says that it can't set the value

I don't want the mouse locked in the middle, i just want the mouse to be moved to the middle of the screen, it is free to move after that.

Any help is appreciated, thanks.

You can also do it like this..

function ReticleUpdate(mouse)
	MouseGUI.MouseUp.Position = UDim2.new(0, mouse.X-2, 0, mouse.Y-30-Recoil)
	MouseGUI.MouseDown.Position = UDim2.new(0, mouse.X-2, 0, mouse.Y+5+Recoil)
	MouseGUI.MouseLeft.Position = UDim2.new(0, mouse.X-30-Recoil, 0, mouse.Y-2)
	MouseGUI.MouseRight.Position = UDim2.new(0, mouse.X+5+Recoil, 0, mouse.Y-2)
	MouseGUI.Hit.Position = UDim2.new(0, mouse.X-32, 0, mouse.Y-32)
end

you can remove the +/- Recoil, just a bit of recoil for the gun MouseGUI is like the part in your GUI, which can be anything.