Attempt to index nil with 'CFrame'

[VonsRevenges (Von)]

You only have one solution which is when the player clicks on a button, fire a remotevent, then change the player’s position through a server script:

Make sure to create a remote event inside replicated storage

-- Client(local):
script.Parent.MouseButton1Click:Connect(function()
	game:GetService("ReplicatedStorage").RemoteEvent:FireServer()
end)

--Server:

local part = workspace:WaitForChild("TeleportPart")
game:GetService("ReplicatedStorage").RemoteEvent.OnServerEvent:Connect(function(player)
	local humanoidrootpart = player.Character:WaitForChild("HumanoidRootPart")
	if humanoidrootpart then
		if part then
			humanoidrootpart.CFrame = part.CFrame
		else
			print("TeleportPart does not exist")
		end
	else
		print("HumanoidRootPart Does not exist")
	end
end)