invalid 'for' limit (number expected, got nil)?

Hello.Yes, its me again. I am trying to make one of those popular "Difficulty Chart Obbies." So here, i am playing with stage saving and completition. What i am trying to do is when a player joins the game all his data gets loaded and the completed stages turn green only for his client. However, this error is preventing me to do that. I have tried using delays, pcalls, if statements and still nothing.This error is really getting me annoyed :(. I am using remote events because as i expect it would fire to the client and not confuse other players.

Remote event definer script (Located is starterPlayerScripts):

game.ReplicatedStorage.PadColorChange.OnClientEvent:Connect(function(plr, StagesValue)
    print("started")
    local BeatenStages = {}
    if StagesValue == 1 then
        game.Workspace[1].BrickColor = BrickColor.new("Lime green")
    end
    local success, errormsg = pcall(function()
    for i = 1,StagesValue do --Line error
        table.insert(BeatenStages, i)
        print("Inserted "..tostring(i))
        end
    end)

    if success then
    for _, v in pairs(BeatenStages) do
        for _, m in pairs(game.Workspace:GetChildren()) do
            if m.Name == tostring(v) and m:IsA("Part") then
                m.BrickColor = BrickColor.new("Lime green")
                print("Color Changed")
            end
        end
        end
    else
        warn("Error: "..errormsg)
    end
end)

And where i pass the parameters (Its just a fragment of code but i am sure you will understand):

    if Data["Stage"] and Data["Level"] then
            Stage.Value = Data["Stage"]
            Level.Value = Data["Level"]
            print(Stage.Value)
            print("Loaded "..PlayerKey.." key successfully!")
            wait(1)
            game.ReplicatedStorage.PadColorChange:FireClient(Player, Stage.Value)

Thanks. If you need more information ask.