Why this error keeps happening? Maximum event re-entrancy depth

When i was scripting a knife for my murder game,i ve got both these errors:

Maximum event re-entrancy depth exceeded for Tool.Equipped

While entering function defined in script 'Players.Player1.Backpack.Default Knife.Script', line 34

And i don't know what to do. Here is my complete Tool.Equipped event

tool.Equipped:connect(function()
	h=tool.Parent.Humanoid
	local sound=Instance.new('Sound',tool)
	sound.SoundId='rbxassetid://'..sounds.equip
	sound:Play()
	sound:Destroy()
	mouseDownCon=mouseDown.OnServerEvent:connect(function()
		if not canKill then
			canKill=true
			local anim=Instance.new('Animation',tool)
			anim.AnimationId='rbxassetid://'..animations.stabs[math.random(1,3)]
			animTrack=h:LoadAnimation(anim)
			animTrack.Priority=Enum.AnimationPriority.Action
			animTrack:Play()
			local sound=Instance.new('Sound',tool)
			sound.SoundId='rbxassetid://'..sounds.striking[math.random(1,4)]
			sound:Play()
			wait(.3)
			animTrack:Stop()
			canKill=false
			anim:Destroy()
			sound:Destroy()
		end
	end)
end)