It just gives me error of index nil Parent
local toolbar = plugin:CreateToolbar("Fishe Industries Whitelister")
local Initiate = toolbar:CreateButton("Initiate", "Initiate", "rbxassetid://489322673")
Initiate.Click:Connect(function()
local Module = script.Parent
local MainFrame = Module:FindFirstChild("FisheIndustries")
MainFrame.Parent = game.CoreGui
end)