Tool animation breaks after the player dies?

So I am trying to figure out how to put animations in tools and it makes absolutely no sense. I've been able to have the animation work and everything but when the player dies and respawns it gives an error saying the animation isn't found in the script, and when I go into the tool after the error is shown the animation is clearly there. Here is the code in a local script in the tool:

local SWING_TIME = 2


local Players = game:GetService("Players")


local canSwing = true

local tool = script.Parent
local player = Players.LocalPlayer
local character = player.Character
if not character then
    character = player.CharacterAdded:Wait()
end
local humanoid = character:WaitForChild("Humanoid")


local r6swing = script:WaitForChild("R6AnimationSwing")
local r15swing = script:WaitForChild("R15AnimationSwing")


while not character:IsDescendantOf(game.Workspace) do
    wait()
end

local rigType = humanoid.RigType
local swing = nil 
if rigType == Enum.HumanoidRigType.R15 then
    swing = humanoid:LoadAnimation(r15swing)
elseif rigType == Enum.HumanoidRigType.R6 then
    swing = humanoid:LoadAnimation(r6swing)
end

while swing.Length == 0 do
    wait()
end
local swingSpeed = swing.Length / SWING_TIME

local function swingTool()
    if canSwing == true then
        -- Keep user from clicking until animation finishes
        canSwing = false


        swing:Play()
        swing:AdjustSpeed(swingSpeed)


        wait(SWING_TIME)
        canSwing = true
    end
end


tool.Activated:Connect(swingTool)