Changing surface ui according to value?

I am trying to change the test of a surface ui according to a value. So basically, i have an object value, and i need the value written onto a surface ui. This is my coding and its not working:

ServerScript:

local obj = script.Parent.Obj
local label = script.Parent.Label.SurfaceGui.TextLabel.Text

game.Players.PlayerAdded:Connect(function()
     if obj.Value ~= nil then
          label = obj.Value
    end
end)

No errors or anything, no spelling mistakes or wrong references. How could i make this work?

Edit: I have solved the problem in this script, but a new problem was created:

This is my script now:

local obj = script.Parent.Obj
local label = script.Parent.Label.SurfaceGui.TextLabel

game.Players.PlayerAdded:Connect(function()
     if obj.Value ~= nil then
          label.Text  = obj.Value
    end
end)

Now i have an error : invalid argument #3 (string expected, got Instance)

The label should hold reference to the TextLabel object for it to work. However label in your script is just a string. Therefore in the function, you are just changing that string to other one.

label holds that new string, but it is just an internal script variable. Here is how it should be done.

local obj = script.Parent.Obj
local label = script.Parent.Label.SurfaceGui.TextLabel --remove .Text

game.Players.PlayerAdded:Connect(function()
     if obj.Value ~= nil then
          label.Text = obj.Value --add .Text here
    end
end)