I need you to help me fix this error in my simulator game. That's all?

Hi, I need help. I was making an simulator and this error showed up: 14:08:45.976 Argument 1 missing or nil - Client - BuyScript:78 Script:

local Player = game.Players.LocalPlayer
local RS = game.ReplicatedStorage
local TS = game:GetService("TweenService")
local UIS = game:GetService("UserInputService")
local MS = game:GetService("MarketplaceService")

function rotateEgg(Egg, Rot, NumberTime)
    local TI = TweenInfo.new(NumberTime)
    local Goal = {CFrame = CFrame.Angles(0,0,math.rad(Rot))}
    local Tween = TS:Create(Egg.PrimaryPart, TI, Goal)
    Tween:Play()
end

function eggAnimation(Egg, Result)
    local FrameClone = Player.PlayerGui.UIelements.HatchFrame:Clone()
    local Folder = RS.Pets.Models:FindFirstChild(Result)
    local Type
    for i,v in pairs(Egg["Pets"]) do
        if v.Name == Result then
            Type = v.Type 
        end
    end
    local PetClone = Folder:FindFirstChild(Type):Clone()
    local EggClone = workspace.Eggs:FindFirstChild(script.Parent.Parent.CurrentTarget.Value).EggModel:Clone()
    local Rarity = Folder.Settings.Rarity.Value
    local RarityColor = RS.Pets.Rarities:FindFirstChild(Rarity).Color.Value
    local Camera = Instance.new("Camera", FrameClone)
    local tweenInfo = TweenInfo.new(.35, Enum.EasingStyle.Quad)
    local EggDelay = .075
    game.Lighting.Blur.Size = 26
    FrameClone.CurrentCamera = Camera
    FrameClone.Parent = Player.PlayerGui.EggPreview
    EggClone.Parent = FrameClone
    EggClone:SetPrimaryPartCFrame(CFrame.new(0,0,0) - Vector3.new(0,10,0))
    Camera.CFrame = (EggClone.PrimaryPart.CFrame + Vector3.new(0,10,0)):ToWorldSpace(CFrame.new(0,0,5.5))
    local bringEgg = TS:Create(EggClone.PrimaryPart, tweenInfo, {Position = EggClone.PrimaryPart.Position + Vector3.new(0,10,0)})
    bringEgg:Play()
    wait(.35)
    for i = 1,7 do
        rotateEgg(EggClone, 15, EggDelay)
        wait(EggDelay)
        rotateEgg(EggClone, -15, EggDelay)
        wait(EggDelay)
        EggDelay = EggDelay - .005
    end
    -- 2.78
    rotateEgg(EggClone, 0, EggDelay)    
    wait(EggDelay)
    FrameClone.FlashEffect1:TweenSize(UDim2.new(1.5,0,1.5,2), "Out", "Linear", .2)
    spawn(function()
        for i = 0,1,.1 do
            FrameClone.FlashEffect1.ImageTransparency = i
            wait(.05)
        end
    end)
    wait(.2)
    PetClone.Parent = FrameClone
    PetClone:SetPrimaryPartCFrame(CFrame.new(0,0,0) * CFrame.Angles(0, math.rad(200), 0))
    EggClone:Destroy()
    FrameClone.PetName1.Text = Result
    FrameClone.PetRarity1.Text = Rarity
    FrameClone.PetRarity1.TextColor3 = RarityColor
    wait(1)
    for i = 1,10 do
        game.Lighting.Blur.Size = game.Lighting.Blur.Size - 2.6
        wait(.05)
    end
    FrameClone:TweenPosition(UDim2.new(0,0,1,0), "Out", "Quad", .2)
    wait(.2)
    FrameClone:Destroy()
end

function eggRequest()
    local Egg = require(RS.Pets.Eggs)[script.Parent.Parent.CurrentTarget.Value]
    if Egg ~= nil then
        if script.Parent.Parent.CurrentTarget.Value ~= "None" then
            if (Player.Character.HumanoidRootPart.Position - workspace.Eggs:FindFirstChild(script.Parent.Parent.CurrentTarget.Value).UIanchor.Position).Magnitude <= 10 then
                local Result, Message = RS.RemoteEvents.EggOpened:InvokeServer(script.Parent.Parent.CurrentTarget.Value, "Single")
                if Message == nil and Result ~= "Error" and Result ~= nil then
                    eggAnimation(Egg, Result)
                else
                    if Message ~= nil then
                        if Message ~= "Robux Purchase" then
                            print("Error, ".. Message)
                        else
                            local ProductID = Egg["ProductID"]
                            if ProductID ~= nil then
                                MS:PromptProductPurchase(Player, ProductID)
                            end
                        end
                    end
                end
            end
        end
    end
end

RS.RemoteEvents.EggOpened.OnClientInvoke = eggAnimation

script.Parent.MouseButton1Click:Connect(function()
    eggRequest()
end)

UIS.InputBegan:connect(function(input,gameProcessed)
    if input.UserInputType == Enum.UserInputType.Keyboard then
        if input.KeyCode == Enum.KeyCode.E then
            if UIS:GetFocusedTextBox() == nil then
                eggRequest()
            end
        end
    end
end)


Error line:
local Result, Message = RS.RemoteEvents.EggOpened:InvokeServer(script.Parent.Parent.CurrentTarget.Value, "Single")