Why doesn't the sword script work with FE?

I've made my own sword and when I test it w/o FE it works fine but with FE it doesn't work and there's no output error.

local player = script.Parent.Parent

local damage = script.Parent.Damage.Value

local attackspeed = 1

local target = "Humanoid"

local tool = script.Parent

local body = script.Parent.Handle

local attacking = false

local ready = true

local speed = attackspeed -.2

function swordUp()
	tool.GripForward = Vector3.new(-1,0,0)
	tool.GripRight = Vector3.new(0,1,0)
	tool.GripUp = Vector3.new(0,0,1)
end

function swordOut()
	tool.GripForward = Vector3.new(0,0,1)
	tool.GripRight = Vector3.new(0,-1,0)
	tool.GripUp = Vector3.new(-1,0,0)
end

local SlashSound = Instance.new("Sound")
SlashSound.SoundId = "rbxasset://sounds\\swordslash.wav"
SlashSound.Parent = body
SlashSound.Volume = .7

local UnsheathSound = Instance.new("Sound")
UnsheathSound.SoundId = "rbxasset://sounds\\unsheath.wav"
UnsheathSound.Parent = body
UnsheathSound.Volume = 1

function onEquipped()
	UnsheathSound:Play()
end
script.Parent.Equipped:Connect(onEquipped)

script.Parent.Handle.Touched:Connect(function (hit)
if attacking == true and hit.Parent:FindFirstChild(target) then
local humanoid = hit.Parent:FindFirstChild(target)
	local vCharacter = tool.Parent
	local vPlayer = game.Players:playerFromCharacter(vCharacter)
	local hum = vCharacter:FindFirstChild("Humanoid")
		
		tagHumanoid(humanoid, vPlayer)
		humanoid:TakeDamage(damage)
		wait(1)
		untagHumanoid(humanoid)
	end
end)

function tagHumanoid(humanoid, player)
	local creator_tag = Instance.new("ObjectValue")
	creator_tag.Value = player
	creator_tag.Name = "creator"
	creator_tag.Parent = humanoid
end

function untagHumanoid(humanoid)
	if humanoid ~= nil then
		local tag = humanoid:findFirstChild("creator")
		if tag ~= nil then
			tag.Parent = nil
		end
	end
end

function onKeyPress(actionName, userInputState, inputObject)
	if userInputState == Enum.UserInputState.Begin and ready == true then
local ready = false
local attacking = true
	swordOut()
	SlashSound:Play()
	wait(.2)
	swordUp()
local attacking = false
	wait(speed)
local ready = true
	else
		wait(0)
	end
	end
 
game.ContextActionService:BindAction("keyPress", onKeyPress, false, Enum.KeyCode.Q)

It won't even change the grip. This is a server script directly inside a tool that's in the player's starterpack.