Custom toolbar isn't working properly, help?

Hi. I tried making a toolbar but for some reason, it didn't add the tool. In line 63, it's not changing nil to a tool or printing. Also, no errors in the output

game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack,false)

-- Tables and vars
local num = {
	
	'1',
	'2',
	'3',
	'4',
	'5',
	'6',
	'7',
	'8',
	'9',
}

local numinwords = {

	'One',
	'Two',
	'Three',
	'Four',
	'Five',
	'Six',
	'Seven',
	'Eight',
	'Nine',
}

local tools = {
	One = nil ,
	Two = nil ,
	Three = nil ,
	Four = nil ,
	Five = nil ,
	Six = nil ,
	Seven = nil ,
	Eight = nil ,
	Nine = nil ,
	
}

local uis = game:GetService('UserInputService')

local plr = game.Players.LocalPlayer

local backpack = game.Players.LocalPlayer:WaitForChild('Backpack')

local frame = script.Parent

local char = plr.Character


for i, v in pairs(backpack:GetChildren()) do
	tools[i] = v
end
--Events
backpack.ChildAdded:Connect(function(tool)
	print('ok')
	for i, v in pairs(tools) do
		
		if v == nil then
			print('ok2') -- It's not printing 'ok2'
			v = tool
			
		end
	end

	for i, v in pairs(tools) do
		print(tostring(v))
	end
	
end)
backpack.ChildRemoved:Connect(function(tool)
	print('ok')
	for i, v in pairs(tools) do
		if v == tool then
			v = nil -- It's not changing it to nil when removed

		end
	end

	for i, v in pairs(tools) do
		print(tostring(v))
	end
end)


for i, v in pairs(frame:GetChildren()) do
	if v:IsA('ImageButton') then
		print('ok')
		uis.InputBegan:Connect(function(input)
			
			if input.KeyCode == Enum.KeyCode[v.Name] then
				print('ok')

				if tools[v.Name] ~= nil then
					
					char.Humanoid:UnequipTool()
					char.Humanoid:EquipTool(tools[v.Name])
				end
			end
			
		end)
	end
end


for i, v in pairs(frame:GetChildren()) do
	if v:IsA('ImageButton') then
		v.MouseButton1Click:Connect(function()
				if tools[v.Name] ~= nil then
					char.Humanoid:UnequipTool()
					char.Humanoid:EquipTool(tools[v.Name])
				end
			

		end)
	end
end

Any help/suggestion is appreciated.