Why won't .Changed for a string value work?

I want to make a local script run a function when the value of a string value called "EquippedWeapon" is changed. Here I have a local script which changes the string value upon a TextButton being pressed

local EquippedWeapon = game.Players.LocalPlayer:WaitForChild("EquippedWeapon").Value

Buttons = {
    script.Parent.Katana -- Katana is the TextButton
}



Buttons[1].MouseButton1Click:Connect(function()
    EquippedWeapon = "Katana"
    wait(1)
    print("EquippedWeapon")
end)

Now, here's a local script in StarterPlayerScripts which runs a function when EquippedWeapon's value changes.

local Player = game.Players.LocalPlayer
local EquippedWeapon = Player:WaitForChild("EquippedWeapon").Value

EquippedWeapon.Changed:Connect(function()
    print("Equipped Weapon value has been changed.")
end)

What should happen is that when EquippedWeapon's value is changed to "Katana", it should print a message. But the error message is this:
"Players.trapiz.PlayerScripts.GearChecker:4: attempt to index field 'Changed' (a nil value)"

Thanks :)