Error: Cannot load the AnimationClipProvider Service when player dies

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#1 
local tool = script.Parent
local debounce = script.Parent.debounce

local uis = game:GetService('UserInputService')

local debounce2 = true

local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()

local animationTrack = char:WaitForChild('Humanoid'):LoadAnimation(script.Parent:WaitForChild('light_swing_anim')) -- errors
local animationTrack2 = char:WaitForChild('Humanoid'):LoadAnimation(script.Parent:WaitForChild('heavy_swing_anim')) -- errors


tool.Activated:Connect(function()
	if debounce.Value and debounce2 and  game.Players.LocalPlayer.Character.Humanoid.Health > 0 then
			animationTrack:Play()	
		game.ReplicatedStorage.events.swordevent:FireServer('hit','light')

	end
end)


script.Parent.Equipped:Connect(function()
	equipped = true
end)
script.Parent.Unequipped:Connect(function()
	equipped = false
end)

uis.InputBegan:Connect(function(input)
	if equipped then
		if debounce.Value and debounce2 then
			if input.UserInputType == Enum.UserInputType.MouseButton2 and debounce.Value and game.Players.LocalPlayer.Character.Humanoid.Health > 0 then
				if  game.Players.LocalPlayer.Character.Humanoid.Health > 0 and game.Players.LocalPlayer.Parent ~= nil then

					animationTrack2:Play()

					game.ReplicatedStorage.events.swordevent:FireServer('hit','heavy')
				end
			end
		end
	end
end)

Error occurs when a player dies and respawns. It is in a local script inside a tool in the starter pack. Works fine until player dies

#2

you’re loading animation that is not loaded yet.

also i recommend to you use animator, instead of humanoid for loading animation

local humanoid = character:WaitForChild("Humanoid")
local animator = humanoid:WaitForChild("Animator")

local animationInstance1 = script.Parent:WaitForChild("light_swing_anim")
local animationInstance2 = script.Parent:WaitForChild("heavy_swing_anim")

local animationTrack1 = animator:LoadAnimation(animationInstance1)
local animationTrack2 = animator:LoadAnimation(animationInstance2)
#3

The error you’re seeing is because char is being set to nil when the player dies and respawns. This is because char is being set to plr.Character , which is nil when the player is dead.

local tool = script.Parent
local debounce = script.Parent.debounce

local uis = game:GetService('UserInputService')

local debounce2 = true

local plr = game.Players.LocalPlayer
local char = plr.CharacterAdded:Wait()

local animationTrack
local animationTrack2

try
	animationTrack = char:WaitForChild('Humanoid'):LoadAnimation(script.Parent:WaitForChild('light_swing_anim'))
catch
	warn("Could not load light swing animation")
end

try
	animationTrack2 = char:WaitForChild('Humanoid'):LoadAnimation(script.Parent:WaitForChild('heavy_swing_anim'))
catch
	warn("Could not load heavy swing animation")
end


tool.Activated:Connect(function()
	if debounce.Value and debounce2 and  game.Players.LocalPlayer.Character.Humanoid.Health > 0 then
			animationTrack:Play()	
		game.ReplicatedStorage.events.swordevent:FireServer('hit','light')

	end
end)


script.Parent.Equipped:Connect(function()
	equipped = true
end)
script.Parent.Unequipped:Connect(function()
	equipped = false
end)

uis.InputBegan:Connect(function(input)
	if equipped then
		if debounce.Value and debounce2 then
			if input.UserInputType == Enum.UserInputType.MouseButton2 and debounce.Value and game.Players.LocalPlayer.Character.Humanoid.Health > 0 then
				if  game.Players.LocalPlayer.Character.Humanoid.Health > 0 and game.Players.LocalPlayer.Parent ~= nil then

					animationTrack2:Play()

					game.ReplicatedStorage.events.swordevent:FireServer('hit','heavy')
				end
			end
		end
	end
end)

This should fix the error and allow the player to use the tool after respawning.

#4

That’s not the problem.
Equipped; Unequipped - only tools event, and by his code, the script is inside tool

The backpack and character as you know are resets when player is dying, so code that inside the tool will just run again and find the character.