attempt to index global 'char' (a nil value). How to fix this?

The scripts works in test mode, but didn't work after I start server. The script work when I reset my character. I'm trying to create pink 'fireball'

In the Player1 Roblox studio output it says this

16:51:07.751 - Players.Player1.Backpack.Massive Pinkball.LocalScript:5: attempt to index global 'char' (a nil value)
16:51:07.752 - Stack Begin
16:51:07.753 - Script 'Players.Player1.Backpack.Massive Pinkball.LocalScript', Line 5
16:51:07.754 - Stack End

This is the local script

local Tool = script.Parent
play = game.Players.LocalPlayer
mouse = play:GetMouse()
char = play.Character
hum = char.Humanoid


local en = true
Tool.Activated:connect(function()
if not en then return end
en = false
Tool.RemoteEvent:FireServer(mouse.Hit)

wait(0.5)
en = true
	
end)

and this is the server script.

local Tool = script.Parent
play = Tool.Parent.Parent 
mouse = play:GetMouse()
char = play.Character
hum = char.Humanoid
root = char.HumanoidRootPart

local en = true

Tool.RemoteEvent.OnServerEvent:connect(function(play,mousehit)
	local a = hum:LoadAnimation(Tool.Throw)
	a:Play()
	root.CFrame = CFrame.new(root.Position,root.Position + Vector3.new(mousehit.lookVector.x,0,mousehit.lookVector.z))
	wait(0.7)
	local pinkball = Tool.Handle:clone()
	pinkball.CFrame = Tool.Handle.CFrame
	local bv = Instance.new("BodyVelocity")
	bv.MaxForce = Vector3.new(1e8,1e8,1e8)
	bv.Velocity = mousehit.lookVector * 50
	bv.Parent = pinkball
	pinkball.CanCollide = false
	pinkball.Parent = game.Workspace
	game.Debris:AddItem(pinkball,4)
	local ten = true
	pinkball.Touched:connect(function(hit)
		if not ten then return end
		ten = false
		local ehum = hit.Parent:findFirstChild("Humanoid")or hit.Parent.Parent:findFirstChild("Humanoid")
		if ehum and ehum ~= hum then
			ehum:TakeDamage(10)
		elseif hit.Anchored == true and hit.CanCollide == true then
			for i=1,10 do
				local part = pinkball:clone()
				part.Size = Vector3.new(0.5,0.5,0.5)
				part.CFrame = pinkball.CFrame
				part.BodyVelocity.Velocity = Vector3.new(math.random(-30,30),math.random(-30,30),math.random(-30,30))
				part.Parent = game.Workspace
				game.Debris:AddItem(part,1)
			end
		end
		
		wait()
		ten = true
	end)
	
end)

Thank you

local script :

local dy = 5 
local Tool = script.Parent  
local play = game.Players.LocalPlayer 
local mouse = play:GetMouse() 
wait(dy) 
local char = play.Character 
local hum = char:findFirstChild("Humanoid")  

Try this? No better solution than to wait 5 seconds in my opinion.