Im trying to make a code script that fires to the server, but i cant get it to work?

So i always get attempt to index nil 'whatever' and im using remote functions, this is when i fire the server

local player = game.Players.LocalPlayer
local textbox = script.Parent.Parent.TextBox
local button = script.Parent
script.Parent.MouseButton1Click:Connect(function(player)
game.ReplicatedStorage.CodeRedeem:FireServer(player, textbox, button)
end

)

and this script is when the server is fired

game.ReplicatedStorage.CodeRedeem.OnServerEvent:Connect(function(player, textbox, button)
	
		local reward = 9000
	if textbox.Text == "E" --Insert Codes here
		then
			print("Right Code")
			button.Text = 'Redeemed!'
			textbox.LocalScript.ching:Play()
			wait(1)
			textbox.Text = "[INSERT CODE HERE]"
			game.Players.LocalPlayer.leaderstats.Cash.Value = game.Players.LocalPlayer.leaderstats.Cash.Value + reward
	else
		print("Wrong Code")
				button.Text = "Invalid Code"
				textbox.LocalScript.error:Play()
				wait(1)
				textbox.Text = "[INSERT CODE HERE]"
		end
end)