Cloning A Tool Into A Player's Backpack? [Answered] [closed]

Script:

script.Parent.MouseButton1Click:connect(function()
    script.Parent.BackgroundColor3 = Color3.new(255,0,0)
    key = game.ServerStorage.RoomKeys.Room1
    clone = key:Clone()
    compuser = game.Workspace.Comp1Plr
    plr = game.Players:FindFirstChild(compuser.Value)
    print("Found Computer User.") --It does print that
    clone.Parent = plr.Backpack
end)

OutPut: Workspace.Comp1.Screen.SurfaceGui.AvailableRooms.Room1.Scri:8: attempt to index global 'plr' (a nil value)