game.Players.LocalPlayer.Backpack:FindFirstChild("RPSCopy") == nil and game.Players.LocalPlayer.Backpack:FindFirstChild("RPSDT") == nil and game.Players.LocalPlayer.Backpack:FindFirstChild("RPSMT") == nil
ERROR:
20:34:25.029 - Players.Player.PlayerGui.rBuild_UI.Navigation_Gamebar.Navig:65: attempt to index local 'RPSDT' (a function value)

2 comments
What is on line 65? Can you please show the whole script?
We need more information than that.. It says you're trying to index a function value on line 65 but I don't see any function OR any line 65.