Why does the error "____ is not a valid member of Hopperbin" return?

Hi Helpers, I've been scripting a place for a bit and I'm using WhupDup's weaponry. Go check it out if you'd like. Anyways, I'm trying to clone a weapon that is in replicated storage and put it into a players backpack. here is the code. (ignore lines 1-38, useless) Once I run it, the error returns, "Body is not a valid member of Hopperbin" PS, Body is part of the weapon that I am trying to clone.

local SGui = Instance.new("ScreenGui")
SGui.Parent = script.Parent
local Duel = Instance.new("TextButton")
local Player = game.Players.LocalPlayer
Duel.Parent = SGui
Duel.Position = UDim2.new(0.45, 0, 0, 0)
Duel.Size = UDim2.new(0.15, 0, 0.1, 0)
Duel.Text = "Switch Teams"
Duel.Font = "Bodoni"
Duel.BackgroundTransparency = 0.4
Duel.BackgroundColor3 = Color3.new(0, 0, 0)
Duel.TextColor3 = Color3.fromRGB(255, 255, 255)
Duel.TextSize = 27
Duel.BorderSizePixel = 0
Duel.TextStrokeColor3 = Color3.fromRGB(214, 205, 81)
Duel.TextStrokeTransparency = 0.7
local TKM = game.ReplicatedStorage.TKMusket
local TKR = game.ReplicatedStorage.TKRifle
local TKS = game.ReplicatedStorage.TKSabre
local M = game.ReplicatedStorage.Musket
local R = game.ReplicatedStorage.Rifle
local S = game.ReplicatedStorage.Sabre

local function SwitchtoShooting()
    Player.Team = game.Teams["Shooting Stalls"]
    Player.Character.Humanoid.Health = 0
end
local function SwitchtoDuelling()
    Player.Team = game.Teams.Duelling
    Player.Character.Humanoid.Health = 0
end
local function SwitchTeam()
    if Player.Team == game.Teams.Duelling then
        SwitchtoShooting()
    else
        SwitchtoDuelling()
    end
    end
local function EnableTK()
    wait(0.2)
    Player.Backpack:ClearAllChildren()
    local TKMC = TKM:Clone()
    wait(0.1)
    TKMC.Parent = Player.Backpack
    local TKRC = TKR:Clone()
        wait(0.1)
    TKRC.Parent = Player.Backpack
    local TKSC = TKS:Clone()
        wait(0.1)
    TKSC.Parent = Player.Backpack
end
local function DisableTK()
    wait(0.2)
    Player.Backpack:ClearAllChildren()
    local MC = M:Clone()
        wait(0.1)
    MC.Parent = Player.Backpack
    local RC = R:Clone()
        wait(0.1)
    RC.Parent = Player.Backpack
    local SC = S:Clone()
        wait(0.1)
    SC.Parent = Player.Backpack

end
if Player.Team == game.Teams.Duelling then
    EnableTK()
end
if Player.Team == game.Teams["Shooting Stalls"] then
    DisableTK()
end
Duel.MouseButton1Click:connect(SwitchTeam)

This is inside a LocalScript inside StarterGui. A response would be appreciated. Thanks a lot!