Roblox Lua cannot access modulescript function - lua

Question

I've been trying to connect a ModuleScript to a server Script, and it's throwing the error: Workspace.Script:6: attempt to call field 'check3' (a nil value)
ModuleScript
local GunStats = {}
local part = workspace:WaitForChild('Mosin'):WaitForChild("Union")
local billboard = workspace:WaitForChild('BillboardPart'):WaitForChild('BillboardGui')
local uis = game:GetService("UserInputService")
local Ekey = Enum.KeyCode.E
local check = false
local start = tick()
local function onpress(action1)
if check then
part.BrickColor = BrickColor.new("Black")
end
end
local function isKeydown(startTime)
return uis:IsKeyDown(startTime) and startTime - tick() <= 5
end
local function Input(input, gameprocessed)
if isKeydown(Ekey) then
print("h")
else
print("n")
end
start = tick()
end
game.Players.PlayerAdded:Connect(function(player)
local character = player.Character or player.CharacterAdded:Wait()
local humRoot = character:WaitForChild("HumanoidRootPart")
uis.InputBegan:Connect(Input)
GunStats.check3 = function()
while wait() do
if (humRoot.Position - part.Position).Magnitude < 5 then
print("IN RANGE")
check = true
billboard.Enabled = true
repeat wait() until (humRoot.Position - part.Position).Magnitude >= 5
elseif (humRoot.Position - part.Position).Magnitude > 5 and check then
check = false
print("OUT OF")
billboard.Enabled = false
end
end
end
end)
return GunStats
Server Script:
local players = game:GetService("Players")
local serverStorage = game.ServerStorage
local gunStats = require(serverStorage:WaitForChild("ModuleScript"))
game.Players.PlayerAdded:Connect(function(players)
gunStats.check3(players)
end)

Answer 1

This issue is because the gunStats.check3() function isn't defined on the GunStats object until after a player joins. I would restructure your ModuleScript so that GunStats.check3() is defined right away :
--[[ define all your helper functions up here ... ]]
local GunStats = {}
function GunStats.check3(player)
-- access the humanoid
local character = player.Character or player.CharacterAdded:Wait()
local humRoot = character:WaitForChild("HumanoidRootPart")
-- do the checks
end
return GunStats