My StarterPack tools are breaking after death. What is happening? How can I fix it?

I inserted a couple of custom guns I made into the StarterPack, then tested. It worked fine, but when I reseted, the guns broke.

The animations still exist within the tool, but the script keeps saying: (animationName) is not a valid member of Tool

I'm so confused. How can I fix this? How can I prevent this from happening?

Here is the portion of the script, defining the animations:

local Equip = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Equip)
local Idle = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Idle)
local Reload = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Reload)
local Fire = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Fire)

Here's the other portion of the script, playing the animations: (yes, its long.)

local UIS = game:GetService("UserInputService")

local camera = workspace.CurrentCamera

local PlayerGui = game.Players.LocalPlayer.PlayerGui

local AmmoGui = PlayerGui:WaitForChild("CHX2Gui")
local currentAmmo = AmmoGui.CurrentAmmo
local maxAmmo = AmmoGui.MaxAmmo

local mouse = game.Players.LocalPlayer:GetMouse()

local backgroundFrame = AmmoGui.BackgroundFrame
local realFrame = AmmoGui.BackgroundFrame.RealFrame

local isFull = true

local emptyAmmoSound = 'rbxassetid://154255000'
local readyAmmoSound = 'rbxassetid://419268760'
local player = game.Players.LocalPlayer or game.Players.PlayerAdded
local character = player.Character or player.CharacterAdded:Wait()
while not character do
    character.AncestryChanged:Wait()
end

local Equip = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Equip)
local Idle = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Idle)
local Reload = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Reload)
local Fire = character:WaitForChild('Humanoid'):LoadAnimation(script.Parent.Fire)

local CanParticle = true

local equipped = false

local IsReloading = false

local mouse = game.Players.LocalPlayer:GetMouse()

local enableMouse = true

UIS.InputBegan:Connect(function(keyCode)
    if keyCode.keyCode == Enum.KeyCode.R then
        if equipped == true then
            if IsReloading == false then
                IsReloading = true
                Reload:Play()
                script.Parent.Handle.Ammo.Transparency = 1
                script.Parent.Handle.PowerPart.Transparency = 1
                reload = false
                enableMouse = false
                backgroundFrame.ImageLabel.Visible = false
                realFrame.BackgroundColor3 = Color3.fromRGB(255,0,0)
                script.Parent.Handle.Reload:Play()
                realFrame:TweenSize(UDim2.new(1,0,1,0),"Out","Sine",script.Parent.Handle.Reload.TimeLength)
                wait(script.Parent.Handle.Reload.TimeLength)
                script.Parent.Handle.Ammo.Transparency = 0
                script.Parent.Handle.PowerPart.Transparency = 0
                realFrame.BackgroundColor3 = Color3.fromRGB(0, 170, 255)
                script.Parent.Handle.Fire.SoundId = readyAmmoSound
                currentAmmo.Value = maxAmmo.Value
                CanParticle = true
                enableMouse = true
                reload = true
                IsReloading = false
            end
        end
    end
end)


script.Parent.Activated:Connect(function()
    if enableMouse == true then
        Fire:Play()
        isFull = false
        currentAmmo.Value = currentAmmo.Value - 1
        realFrame:TweenSize(UDim2.new(1,0,currentAmmo.Value / maxAmmo.Value),'In','Sine',.1)
        script.Parent.Handle.Fire:Play()
        if CanParticle == true then
            script.Parent.Handle.Muzzle.Fire_Effect.ParticleEmitter.Enabled = true
            wait()
            script.Parent.Handle.Muzzle.Fire_Effect.ParticleEmitter.Enabled = false
        end
        if enableMouse == true and currentAmmo.Value <= 0 then
            CanParticle = false
            reload = true
            script.Parent.Handle.Fire.SoundId = emptyAmmoSound
            backgroundFrame.ImageLabel.Visible = true
            realFrame.BackgroundColor3 = Color3.fromRGB(255,0,0)
            currentAmmo.Value = 0
        end
    end
end)

--ADS part

UIS.InputBegan:Connect(function(keyCode)
    if keyCode.keyCode == Enum.KeyCode.Q then
        if equipped == true then
            for i = camera.FieldOfView,60,-1 do
                camera.FieldOfView = i
                wait()
            end
        end
    end
end)
UIS.InputBegan:Connect(function(keyCode)
    if keyCode.keyCode == Enum.KeyCode.Q then
        if equipped == true then
            for i = camera.FieldOfView,70,1 do
                camera.FieldOfView = i
                wait()
            end
        end
    end
end)

--equipped and unequipped



Idle.Looped = true
script.Parent.Equipped:Connect(function()
    mouse.Icon = 'rbxassetid://117431027'
    AmmoGui.Enabled = true
    Equip:Play()
    wait(1.25)
    script.Parent.Handle.Bolt:Play()
    wait(0.25)
    Idle:Play()

    equipped = true
end)

script.Parent.Unequipped:Connect(function()
    mouse.Icon = 'rbxassetid://442141180'
    AmmoGui.Enabled = false
    equipped = false
    Reload:Stop()
    Fire:Stop()
    Equip:Stop()
    Idle:Stop()
end)

Sorry if the second script is long. This is all in a LocalScript inside of the tool.