String expected, got Object error message?

I am made a chat command which gives the item a player is holding but the code keeps giving this error message, I'm guessing it is the backpack but I don't know for sure how to fix it, any help? (Btw I am using a server script)

local Players = game:GetService("Players")
local Prefix = ";"
local GroupId = 5059774


function GetPlayer(targetedPlayerName)
      for _,player in pairs(game:GetService("Players"):GetPlayers()) do
            if targetedPlayerName:lower() == player.Name:sub(1,targetedPlayerName:len()):lower() then
                return player 
            end
        end
        return nil 
end

Players.PlayerAdded:Connect(function(Player)
	if Player:GetRankInGroup(GroupId) >= 249 then
		Player.Chatted:Connect(function(msg)
			
			if msg:sub(1,11) == Prefix.."AddPoints " or msg:sub(1,11) == Prefix.."addpoints " then
				
				local Amount = msg:sub(12,13) or msg.sub(12,12)
				if msg:sub(15) == "me" or msg:sub(14) == "me" then
					Player.leaderstats["Cafe Points"].Value = Player.leaderstats["Cafe Points"].Value + Amount
				else
					local Target = GetPlayer(msg:sub(15)) or GetPlayer(msg:sub(14))
					Target.leaderstats["Cafe Points"].Value = Target.leaderstats["Cafe Points"].Value + Amount
				end
			end
			
			if msg:sub(1,10) == Prefix.."GiveItem " or msg:sub(1,10) == Prefix.."giveitem " then
				local Target = GetPlayer(msg:sub(11))
				for _,v in pairs(workspace[Player.Name]:GetChildren()) do
					if v:IsA("Tool") then
						local Thing = v.Name
						print(Thing)
						local Item = game.Lighting[Thing]:Clone()
						print(Item.Name)
						print(Target)
						print(Players[Target].Name) 
					end
				end
			end
		end)
	end
end)

Full error message: ServerScriptService.ServerScripts.CustomCmds:39: bad argument #2 to '?' (string expected, got Object)