Local player a nil value?

I made two scripts and they both don't work.In the output it says for both of them: "attempt to index 'plr' (a nil value)". Could anyone please help point out the problem. Here are both of the scripts:

local plr = game:GetService("Players").LocalPlayer
local Character = plr.Character or plr.CharacterAdded:Wait()
local Humanoid = Character:WaitForChild("Humanoid")
local vr = game.StarterGui.ScreenGui.Frame.RedPlayer.RedPlayerScore.RedValue
local vb = game.StarterGui.ScreenGui.Frame.BluePlayer.BluePlayerScore.BlueValue

Humanoid.Died:Connect(function()
   if plr.TeamColor == BrickColor.new("Bright blue") then
    vr = vr + 1
    else
        vb = vb + 1

end

end)

Second one:

local plr = game.Players.LocalPlayer
local f = game.StarterGui.ScreenGui.Frame
local rn = f.RedPlayer.RedPlayerName
local bn = f.BluePlayer.BluePlayerName

if plr.TeamColor == BrickColor.new("Bright blue") then
    bn.Text = plr.Name
else
        rn.Text = plr.Name
end

Thank you for trying to help. I appreciate it very much.