Animation fails to load in? Animation doesn't play error

It's a serverscript inside a tool (in starterpack). The animation fails to load in.

ERROR: 'Animation ... failed to load in ...' I added dots to places in the game that don't actually matter. Animation works in studio and local servers

local tool = script.Parent
local handle = script.Parent:WaitForChild('Handle')

local Debounce = true
local slash = script.Parent:WaitForChild('Slash')

local click = false
local inAttack = false

AniDebounce = true
AxeDebounce = true

tool.Activated:connect(function()
	
	local plr = game.Players:GetPlayerFromCharacter(tool.Parent)
	local char = plr.Character
	if char then
	local hum = char:WaitForChild('Humanoid')                        
	local slashTrack = hum:LoadAnimation(slash)
	wait(0.1)
		if AniDebounce then
			slashTrack:Play()
							
			AniDebounce = false
		end
	end
	
	inAttack = true
	if Debounce then
		Debounce = false
		click = true
		print('tool activated')
		
		local plr = game.Players:GetPlayerFromCharacter(tool.Parent)
		
		if plr then	
			handle.Touched:connect(function(hit)
				if inAttack then
					
					print('animation')
				
					-- Animation
						
						local char = plr.Character
						if char then
							local hum = char:WaitForChild('Humanoid')                        
							local slashTrack = hum:LoadAnimation(slash)
							wait(0.1)
							if AniDebounce then
								slashTrack:Play()
								
								AniDebounce = false
							end
						end
					
					-- Tree damage
					
					if hit.Parent and hit.Parent.Name ~= plr.Name and hit.Parent:FindFirstChild('Wood') and AxeDebounce then
						AxeDebounce = false
						local HP = hit.Parent.HP
						HP.Value = HP.Value - 30  
						
						if HP.Value <= 30 then
							
							-- Earn wood
							
						end            
					end
					
				else
					print(Debounce)
					print(click)
				end
			end)
		end
		
		wait(0.5)
		click = false
		inAttack = false

		wait(5)

		Debounce = true
	end
end)

while wait() do
	if AniDebounce == false then
		wait(2)
		AniDebounce = true
		AxeDebounce = true
	end
end