Argument 1 missing or nil? Trying to make a hotel key giver script.. Please help?

script.Parent.MouseButton1Down:connect(function()
	p = game.Players:FindFirstChild(script.Parent.Parent.Name.Text)
	for i,v in pairs(game.Players:GetPlayers()) do
		c = v.Backpack:FindFirstChild('Room'..script.Parent.Parent.RoomNum.Text)
		if c then
			script.Parent.Text = "Room Taken!"
			script.Parent.TextColor3 = Color3.new(255,0,0)
			wait(3)
			script.Parent.Text = "Give Player Room Key (Must Be Full Name)"
			script.Parent.TextColor3 = Color3.new(0,255,0)
		else
			key = game.ServerStorage.Room101:Clone()
			key.Name = "Room"..script.Parent.Parent.RoomNum.Text
			key.Parent = p.Backpack
		end
	end
end)

Moderator note: Please use Lua code blocks for lua code, and format your code before posting.