what do i need to change for this to become FE (works in test mode, not in servers)?

script.Parent.RemoteEvent.OnServerEvent:connect(function(player, arguments)
while true do
	wait(45)
	local char = script.Parent --the npc
	local hum = char:WaitForChild("Humanoid") --the npc's humanoid
	local animation = hum:LoadAnimation(script.Animation)
	local HP = script.Parent.Humanoid.WalkSpeed
	wait()
	wait(.1)	
	animation:Play()
	wait(1)
	local dust = Instance.new("Part")
	dust.Transparency = 0.2
	dust.Name = "Snap"
	dust.Size = Vector3.new (90,90,90)
	dust.Anchored = true
	dust.CanCollide = false
	dust.Parent = game.Workspace
	dust.Material = "Neon"
	dust.Color = Color3.new (180, 110, 255)
	local bang = Instance.new ("Sound")
	bang.SoundId = "rbxassetid://1421442974"
	bang.Volume = 10
	bang.Looped = false
	bang.Parent = game.Workspace
	local mesh = Instance.new ("SpecialMesh")
	mesh.MeshType = ("Sphere")
	mesh.Parent = dust
	spawn(function()
		while true do
			wait()
			mesh.Scale = mesh.Scale + Vector3.new(.1,.1,.1)
			dust.Transparency = dust.Transparency + 0.005
		end
	end)
	game.Debris:AddItem(dust,7)
	game.Debris:AddItem(bang,7)
	dust.Touched:connect((function(hit)
		wait()
		human = hit.Parent:FindFirstChild("Humanoid")
		if human ~= nil then
			local bv = Instance.new("BodyVelocity")
			bv.maxForce = Vector3.new(1e990, 1e990, 1e990)
			bv.Velocity = Vector3.new (0,200,0)
			bv.Parent = human.Parent.Head
			game:GetService("Debris"):AddItem(bv, 0.05)
			human.PlatformStand = true
			wait(1)
			human.PlatformStand = false
			wait(5)
			dust:Destroy()
		end
	end))
	wait()
	game.Workspace.Sound.Playing = true
end
end)

i dont know what needs to be changed in this so its FE compatible any help?