help please"- ServiceScriptService is not a valid member of DataModel" ?

local cost = 2500

local PetModule = require(game.ServiceScriptService:WaitForChild("PetModule"))

script.Parent.ClickDetector.MouseClick:Connect(function(player)

if player.leaderstats.Cash.Value >= cost then

    player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - cost


    local pet = PetModule.choseRandomPet()

    print(pet.Name.." selected")

    game.ReplicatedStorage.HatchEgg:FireClient(player,pet)

end

end)

Thanks for help