Remote event problems - Just practicing

Not sure why this is happening. OnServerEvent is stated in Documentation

-- ServerScript/ServerScriptService

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local event = ReplicatedStorage:FindFirstChild("RarityEvent")
if not event then
	event = Instance.new("RemoteEvent")
	event.Name = "RarityEvent"
	event.Parent = ReplicatedStorage
end

local function createEvent(player, rarity)
	print(player.Name .. " just discovered a " .. rarity)

end

ReplicatedStorage.RarityEvent.OnServerEvent:Connect(createEvent)

-- LocalScript/StarterplayerScripts

local RandomNumberGenerator = require(script.RandomNumberGenerator)
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RanNumGui = game:GetService("StarterGui"):FindFirstChild("RandomNumberGui")
local button = RanNumGui.TextButton

button.MouseButton1Click:Connect(function()
	local rarity = RandomNumberGenerator.Generate()
	local textLabel = button.TextLabel
	textLabel.Text = tostring(rarity)
	
	if rarity ~= "Common" then
		ReplicatedStorage:FindFirstChild("RarityEvent"):FireServer(game.Players.LocalPlayer, rarity)
	end
end)

--ModuleScript/StarterPlayerScripts.LocalScript.RandomNumberGenerator

local module = {}

function module.Generate()
	local rarity
	local randomNumber = math.random(1, 10000)
	if randomNumber <= 7500 then
		rarity = "Common"
	elseif randomNumber <= 9500 then
		rarity = "Uncommon"
	elseif randomNumber <= 9900 then
		rarity = "Rare"
	elseif randomNumber <= 9990 then
		rarity = "Epic"
	else
		rarity = "Legendary"
	end
	return rarity
end

return module


You forgot to add :Connect

ReplicatedStorage.RarityEvent.OnServerEvent:Connect(createEvent)
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No that wasn’t it but thanks for the error update.

EDIT!!! I found the issue was I’d made a RemoteFunction and not RemoteEvent.

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