Cure Simulator | DataStore doesn't work and leaderstats doesn't work. Why?

I got a big problem because my DataStore doesn't work and leaderstats doesn't work and I would like some help

There's another problem too: 15:58:28.029 - Settings is not a valid member of Folder 15:58:28.029 - Stack Begin 15:58:28.030 - Script 'ServerScriptService.Script', Line 70 15:58:28.031 - Stack End

Images for where is my stuff:

Biomes folder is in workspace: https://gyazo.com/4d4e99a072148068ef3eed78e09801f5 _ Other: https://gyazo.com/76fb3959c087032beafe3e78b8014a77

ServerScriptService Script:

local Players = game:GetService("Players")

local RS = game:GetService("ReplicatedStorage")

local SS = game:GetService("ServerStorage")

local DSS = game:GetService("DataStoreService")

local RunService = game:GetService("RunService")

local ReplicatedModules = RS:WaitForChild("Modules")

local InsCreator = require(ReplicatedModules.InstanceCreator)

local DataStore = DSS:GetDataStore("Test")

function GetRandomCFrame(Part,NewPart)
    local X, Z = Part.Size.X/2,Part.Size.Z/2
    local RX,RZ = math.random(-X,X),math.random(-Z,Z)
    return Part.CFrame * CFrame.new(RX, {Part.Position.Y + NewPart.Size.Y + 0.3},RZ)
end

local function PlayerAdded(plr)
    local leaderstats = InsCreator.create("Folder", {Name = "leaderstats", Parent = plr})
    local Tubes = InsCreator.create("IntValue", {Name = "Tubes", Value = 0})
    local CURP = InsCreator.create("StringValue", {Name = "CURP", Value = 0})
    local Rebirths = InsCreator.create("StringValue", {Name = "Rebirths", Value = 0})

    local key = string.format("$s's data",plr.UserId)

    local success, err = pcall(function()
        local save = DataStore:GetAsync(key)
        if save then
            Tubes.Value = save[1]
            CURP.Value = save[2]
            Rebirths.Value = save[3]
        end
    end)
        if success then
            print(string.format("loaded $s's data",plr.Name))
    elseif err then
                warn(err)
        end
    leaderstats.Parent = plr
    Tubes.Parent = leaderstats
    CURP.Parent = leaderstats
    Rebirths.Parent = leaderstats


end

local function PlayerRemoving(plr)
    local key = string.format("$s's data",plr.UserId)
    local ls = plr.leaderstats
    local success, err = pcall(function()
        DataStore:SetAsync(key,{ls.Tubes.Value, ls.CURP.Value, ls.Rebirths.Value})
        end)

        if success then
            print(string.format("saved $s's data",plr.Name))
    elseif err then
                warn(err)
        end

end

for a, biome in pairs(workspace:WaitForChild("Biomes"):GetChildren()) do
    spawn(function()
        RunService.Heartbeat:Connect(function()
            for i, tube in pairs(biome.Settings.Tubes:GetChildren()) do
                tube.CFrame = tube.CFrame * CFrame.fromEulerAnglesXYZ(0.02,0.02,0.02)

                end
            end)
        end)
            while true do
                if biome.Settings.MaxTubes.Value > #biome.Tubes:GetChildren() then
                    local TubesToClone = biome.Settings.Tubes:Getchildren()
                    local SelectedTubes = TubesToClone[math.random(1,#TubesToClone)]
                    local NewTube = SS.Prefabs:FindFirstChild(SelectedTubes.Name):Clone()
                    local Amount = math.random(math.floor(NewTube.Value.Value/1.25),math.floor(NewTube.Value.Value*1.25))
                    NewTube.CFrame = GetRandomCFrame(biome.Baseplate,NewTube)
                    NewTube:WaitForChild("TubeValueGUI").Value.Text = Amount
                    NewTube.Parent = biome.Tubes
                end 

    end
end



Players.PlayerAdded:Connect(PlayerAdded)
Players.PlayerRemoving:Connect(PlayerRemoving)

Module script in replicatedstorage:

local InstanceCreator = {}

function InstanceCreator.create(class,properties)
    local newItem = {}
    newItem = Instance.new(class)
    for i, v in pairs(properties) do
        newItem[i] = v
    end
    return newItem
end

return InstanceCreator

Please help, thanks!