How to solve the store script problem? Hello everyone, I'm a beginner game developer

recently started writing scripts and I got this error the script itself is here

PlayerGui.ShopGui.Frame.ScrollingFrame_12.ScrollingFrame.Arranger:9: attempt to index nil with 'IsA'

and script

game.ReplicatedStorage.GameClient.Events.RemoteEvent.PlayerLoaded:FireServer()
print("PlayerLoaded")
local player = game.Players.LocalPlayer
local number = 1
game.ReplicatedStorage.GameClient.Events.RemoteEvent.BeginArrangement.OnClientEvent:Connect(function()
	print("Got")
	repeat
		local image = game.ReplicatedStorage.ToolsImage:FindFirstChild(number)
		if image:IsA ("ImageLabel") then
			print(image.Name)
			local clone = game.ReplicatedStorage.Template:Clone()
			clone.ToolImageDisp.ImageLabel.Image = image.Image
			clone.Name = image.Name
			clone.CostDisplay.Value = image.Cost.Value
			clone.ToolName.Value = image.ToolName.Value
			clone.Parent = script.Parent
			clone.ToolImageDisp.ImageLabel.ImageColor3 = Color3.fromRGB(0,0,0) 

			if clone.Name == "1" then
				local sidemenu = script.Parent.Parent.Parent.SideMenu
				sidemenu.ImageOftool.Image = image.Image
				sidemenu.ImageOftool.ImageColor3 = Color3.fromRGB(255,255,255)
				sidemenu.BuyButton.TextButton.Text = "Equip"
				sidemenu.Cost.CostOfTool.Value = 0
				sidemenu.Cost.CostDisplayer.Text = "Cost : 0"
				sidemenu.NameOftool.TextLabel.Text = clone.ToolName.Value

			end

			if player.OwnedItems:FindFirstChild(clone.ToolName.Value) then
				clone.ToolImageDisp.ImageLabel.ImageColor3 = Color3.fromRGB(255,255,255)
			end

			local equipped = player:WaitForChild("Equipped")
			if equipped.Value~= nil then
				if clone.ToolName.Value == equipped.Value then
					local sidemenu = script.Parent.Parent.Parent.SideMenu
					sidemenu.ImageOftool.Image = image.Image
					sidemenu.ImageOftool.ImageColor3 = Color3.fromRGB(255,255,255)
					sidemenu.BuyButton.TextButton.Text = "Equipped"
					sidemenu.Cost.CostOfTool.Value = clone.CostDisplay.Value
					sidemenu.Cost.CostDisplayer.Text = "Cost : "..sidemenu.Cost.CostOfTool.Value
					sidemenu.NameOftool.TextLabel.Text = clone.ToolName.Value
					game.ReplicatedStorage.GameClient.Events.RemoteEvent.EquipTool:FireServer(equipped.Value)
				end
			end

			local number = tonumber(clone.Name)
			if number ~= 1 then
				local previousnum = number-1
				local itemfound = script.Parent:FindFirstChild(previousnum)
				if itemfound then
					if player.OwnedItems:FindFirstChild(itemfound.ToolName.Value) then
						clone.ToolImageDisp.ImageLabel.ImageColor3 = Color3.fromRGB(255,255,255) 
					end 
				end
			end
		end
		number = number+1
	until number == game.ReplicatedStorage.TotalTools.Value + 1
end)

GUYS PLS HELP ME