53 Attempt To Index Nill with "Rarity" HELP?

error: 53 Attempt To Index Nill with "Rarity"

I make a case in the game, add different skins for weapons there, a couple of common skins, a couple more uncommon and 1 legendary and another godly. And here is such a mistake when I try to open a case in the store... please help me!!

script

-- goro7

-- Basic settings
local FADED_COLOR = Color3.fromRGB(60, 60, 60)

local plr = game.Players.LocalPlayer

local commonColor = plr:WaitForChild("PlayerScripts"):WaitForChild("Functions"):WaitForChild("GetRarityColor"):Invoke("Common")
local uncommonColor = plr:WaitForChild("PlayerScripts"):WaitForChild("Functions"):WaitForChild("GetRarityColor"):Invoke("Uncommon")
local rareColor = plr:WaitForChild("PlayerScripts"):WaitForChild("Functions"):WaitForChild("GetRarityColor"):Invoke("Rare")
local legendaryColor = plr:WaitForChild("PlayerScripts"):WaitForChild("Functions"):WaitForChild("GetRarityColor"):Invoke("Legendary")
local godlyColor = plr:WaitForChild("PlayerScripts"):WaitForChild("Functions"):WaitForChild("GetRarityColor"):Invoke("Godly")

function sortByName(x, y)

    -- Convert to lowercase
    local xString = string.lower(x.Value.Name)
    local yString = string.lower(y.Value.Name)

    -- Convert to byte values
    local xBytes = {}
    for i=1, string.len(xString) do
        table.insert(xBytes, string.byte(xString, i, i))
    end
    local yBytes = {}
    for i=1, string.len(yString) do
        table.insert(yBytes, string.byte(yString, i, i))
    end

    -- See if Y ever less than up X
    local xIsLess = false
    for i=1, #yBytes do
        if table.getn(xBytes) < i then
            xIsLess = true
            break
        end
        if xBytes[i] < yBytes[i] then
            xIsLess = true
            break
        elseif xBytes[i] > yBytes[i] then
            break
        end
    end

    -- Return result
    return xIsLess

end

function sortByRarityAndName(x, y)

    -- Assign numbers for rarity
    local rarityX = plr.PlayerScripts.Functions.GetRarityValue:Invoke(x["Value"].Rarity.Value)
    local rarityY = plr.PlayerScripts.Functions.GetRarityValue:Invoke(y["Value"].Rarity.Value)

    -- Sort by name if same
    if rarityX == rarityY then
        return sortByName(x, y)
    end

    -- Return comparison
    return (rarityX > rarityY)

end

script.Parent.ShowCase.Event:connect(function(case)

    -- Delete all currently listed items
    for _, i in pairs(script.Parent:GetChildren()) do
        if i.Name == "Item" then
            i:destroy()
        end
    end

    -- Create an item for each
    local entries = case.Contents:GetChildren()
    table.sort(entries, sortByRarityAndName)
    for n, i in pairs(entries) do
        local item = i.Value
        local itemGui = script.Parent.ItemTemplate:clone()
        itemGui.Name = "Item"
        itemGui.Item.Value = item
        itemGui.ItemIcon.Image = item.IconAsset.Value
        itemGui.ItemName.Text = item.Name
        itemGui.ItemRarity.Text = item.Rarity.Value
        itemGui.ItemName.TextColor3 = plr.PlayerScripts.Functions.GetRarityColor:Invoke(item.Rarity.Value)
        itemGui.Position = UDim2.new(0, ((n - 1) % 4) * 100 + 10, 0, math.floor((n - 1) / 4) * 100 + 10)
        itemGui.Parent = script.Parent
        itemGui.Visible = true
        itemGui.InteractionHandler.Disabled = false
    end

    -- Size the scrolling frame
    script.Parent.CanvasSize = UDim2.new(0, 0, 0, math.ceil(#entries / 4) * 100 + 20)

    -- Disable preview
    plr.PlayerGui.MainGui.Shop.Preview.PixelVerticalOffset.Value = -5
    plr.PlayerGui.MainGui.Shop.Preview.Scale.Value = 24
    plr.PlayerGui.MainGui.Shop.Preview.Item.Value = entries[1].Value

    -- Set up main case sidebar items
    local caseSidebar = script.Parent.Parent.Parent.CaseSidebar
    caseSidebar.Visible = true
    caseSidebar.BuyButton.Case.Value = case
    caseSidebar.Price.Text = case.Price.Value .. "     "
    caseSidebar.Price.CoinImage.Position = UDim2.new(0.5, caseSidebar.Price.TextBounds.X / 2 - 13, 0, 4)

    -- Set percentages
    local total = case.CommonChance.Value + case.UncommonChance.Value + case.RareChance.Value + case.LegendaryChance.Value
    caseSidebar.CommonChance.Text = tostring((case.CommonChance.Value / total) * 100) .. "%"
    caseSidebar.UncommonChance.Text = tostring((case.UncommonChance.Value / total) * 100) .. "%"
    caseSidebar.RareChance.Text = tostring((case.RareChance.Value / total) * 100) .. "%"
    caseSidebar.LegendaryChance.Text = tostring((case.LegendaryChance.Value / total) * 100) .. "%"
    if case.GodlyChance.Value > 0 then
        caseSidebar.GodlyChance.Text = "???%"
    else
        caseSidebar.GodlyChance.Text = "0%"
    end

    -- Fade percentages if 0
    if caseSidebar.CommonChance.Text == "0%" then
        caseSidebar.CommonChance.TextColor3 = FADED_COLOR
        caseSidebar.CommonChance.Label.TextColor3 = FADED_COLOR
    else
        caseSidebar.CommonChance.TextColor3 = commonColor
        caseSidebar.CommonChance.Label.TextColor3 = commonColor
    end
    if caseSidebar.UncommonChance.Text == "0%" then
        caseSidebar.UncommonChance.TextColor3 = FADED_COLOR
        caseSidebar.UncommonChance.Label.TextColor3 = FADED_COLOR
    else
        caseSidebar.UncommonChance.TextColor3 = uncommonColor
        caseSidebar.UncommonChance.Label.TextColor3 = uncommonColor
    end
    if caseSidebar.RareChance.Text == "0%" then
        caseSidebar.RareChance.TextColor3 = FADED_COLOR
        caseSidebar.RareChance.Label.TextColor3 = FADED_COLOR
    else
        caseSidebar.RareChance.TextColor3 = rareColor
        caseSidebar.RareChance.Label.TextColor3 = rareColor
    end
    if caseSidebar.LegendaryChance.Text == "0%" then
        caseSidebar.LegendaryChance.TextColor3 = FADED_COLOR
        caseSidebar.LegendaryChance.Label.TextColor3 = FADED_COLOR
    else
        caseSidebar.LegendaryChance.TextColor3 = legendaryColor
        caseSidebar.LegendaryChance.Label.TextColor3 = legendaryColor
    end
    if caseSidebar.GodlyChance.Text == "0%" then
        caseSidebar.GodlyChance.TextColor3 = FADED_COLOR
        caseSidebar.GodlyChance.Label.TextColor3 = FADED_COLOR
    else
        caseSidebar.GodlyChance.TextColor3 = godlyColor
        caseSidebar.GodlyChance.Label.TextColor3 = godlyColor
    end

    -- Set visiblities
    script.Parent.Parent.Visible = true
    script.Parent.Parent.Parent.Display.Visible = false
    script.Parent.Parent.Parent.Sidebar.Visible = false

end)

script.Parent.ReturnToPreviousView.Event:connect(function()

    -- Show previous preview
    plr.PlayerGui.MainGui.Shop.Preview.PixelVerticalOffset.Value = -2
    plr.PlayerGui.MainGui.Shop.Preview.Scale.Value = 18
    plr.PlayerGui.MainGui.Shop.Preview.Item.Value = nil

    -- Set visiblities
    script.Parent.Parent.Visible = false
    script.Parent.Parent.Parent.CaseSidebar.Visible = false
    script.Parent.Parent.Parent.Display.Visible = true
    script.Parent.Parent.Parent.Sidebar.Visible = true

end)