Error that says user data value. Trying to do a script??

Hi, I'm trying to make a game. I will not say anything about the game besides what I need to help for. Because I don't want to leak the game.

It's a status thing, when the intermission is done it spawns chests, and then other better chests. I am using a usage of Module script etc.

The problem is not the module script but when it tries to spawn the chests. Error: "17:19:52.930 - ServerScriptService.Handler:25: attempt to get length of local 'normal' (a userdata value)"

This is the script:

local m = require(game.ServerStorage.RoundAPI) -- requires the module script.
local chests = game.ReplicatedStorage.Chests -- locates the chests folder i nthe replicated storage
local legendary = chests.Legendary -- where the legendary chests are
local rare = chests.Rare -- where the rare chests are
local normal = chests.Normal -- where the normal chests are

while wait() do
	for i = 15,0,-1 do
		m.updateStatus("Intermission: "..i.." Seconds!")
		wait(1)
	end
	for _, player in pairs(game.Players:GetPlayers()) do
		if player.Character then
			player.Character:MoveTo(workspace.PlayingSpawn.Position)
		end
	end
	m.updateStatus("Get Ready...")
	wait(1)
	m.updateStatus("Get Set...")
	wait(1)
	m.updateStatus("Go!")
	wait(.3)
	m.updateStatus("Normal Chests Spawning...")
	wait(.7)
	for y = 5,#normal do -- It spawns 5 chests. One chest every 3 seconds.
		local newNormal = normal[y]:Clone() -- clones the chest
		newNormal.Parent = workspace.CurrentChests.Normal -- put the chest in the folder in workspace
		wait(3) -- wait 3 seconds, and then repeats this 5 times.
	end -- ends the 
	wait(10)
	m.updateStatus("More normal chests spawning...")
	wait(.7)
	for z = 5,#normal do
		local newNormal = normal[z]:Clone()
		newNormal.Parent = workspace.CurrentChests.Normal
		wait(3)
	end
	wait(15)
	m.updateStatus("Rare chests spawning...")
	wait(math.random(.7,1.7))
	for g = 3,#rare do
		local newRare = rare[g]:Clone()
		newRare.Parent = workspace.CurrentChests.Rare
		wait(5)
	end
	wait(25)
	m.updateStatus("Legendary chests spawning...")
	wait(3)
	m.updateStatus("You have 10 seconds on you before the chests clears!")
	wait(math.random(.7,1.7))
	for h = 4,#legendary do
		local newLegendary = legendary[h]:Clone()
		newLegendary.Parent = workspace.CurrentChests.Legendary
		wait()
	end
	for l = 10,0,-1 do
		m.updateStatus("Chests Clear in: "..l.." Seconds!")
		wait(10)
	end
	workspace.CurrentChests.Legendary:ClearAllChildren()
	workspace.CurrentChests.Rare:ClearAllChildren()
	workspace.CurrentChests.Normal:ClearAllChildren()
	wait(.6)
	for d = 3,0,-1 do
		m.updateStatus("End in: "..d.." Seconds!")
		wait(.1)
	end
end

There is more to the script but it's not neccessary.