Attempt to call a nil value on something that exists? line 14 server script

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-- Local Script

local sss = game:GetService("ServerScriptService")
local rs = game:GetService("ReplicatedStorage")
local players = game:GetService("Players")
local player = players.LocalPlayer
local remotes = rs:WaitForChild("Remotes")
local lick4 = remotes.Lick2
local lolipop4 = script.Parent
local mouse = player:GetMouse()
local clicked = false
local licktimeModule = require(rs.toolLick)
local char = player.Character or player.CharacterAdded:wait()
local backpack = player:WaitForChild("Backpack")
local tool_Name4 = script.Parent.Name
local tool4 = script.Parent
local soundService = game:GetService("SoundService")
local sounds = soundService:WaitForChild("Sounds")
local licksound = sounds.lickSound

lolipop4.Activated:Connect(function()
	
	
	if not clicked then
	
		clicked = true
		lick4:FireServer(tool_Name4,tool4)
		licksound:Play()
		licktimeModule.TringPop1cooldown()
		clicked = false
		
		
	end
	
end)

-- Server Script 

lick2.OnServerEvent:connect(function(player,tool4,tool_Name4)-- TringPop1 Event Fired
		warn("Lick2 event fired")
		
		print(tool_Name4)
		local dataFolder = playerdata:FindFirstChild(player.Name)
		
		
		if not	dataFolder then 
			return ("noFile")
		else
			
			local lickAdditionValue4 = tool4:FindFirstChild("TringPop1lickValue").Value
			player.leaderstats.Licks.Value = player.leaderstats.Licks.Value + lickAdditionValue4
			 
			
			while wait() do
				for i,v in pairs (backpack:GetChildren() and char:GetChildren()) do
					if v == tool4 or v.Name == tool_Name4 then
						print("Tool1 found")
						if player.leaderstats.Licks.Value == (136) then
							player.leaderstats.Licks.Value = player.leaderstats.Licks.Value - lickAdditionValue4
							
						end
					end
				end
				break
			end
		end 
			wait(5)
			print(player.leaderstats.Licks.Value)
			
	end)-- TringPop1 Event End

i think you might have mixed up the variables in firing the server in line 27 inside the local script you wrote

lick4:FireServer(tool_Name4,tool4)

but in the server script line 3 you have

lick2.OnServerEvent:connect(function(player,tool4,tool_Name4)

so tool4 and tool_name4 switched variables and in line 14 you have

local lickAdditionValue4 = tool4:FindFirstChild("TringPop1lickValue").Value

you can't check the value of a name