Fehler ingame Bannpanel Quest

quest gm_panel begin  
	state start begin  
		when login with pc.is_gm() begin  
			send_letter("Sharzun - Bann Panel") 
		end 
		when button or info begin  
			say_title("Sharzun - BannPanel") 
			say("Hier kannst du folgende Dinge tun:") 
			say("") 
			say("- Einen Spieler Bannen") 
			say("- Einen Spieler Entbannen") 
			say("") 
			local a = select("Ban Player", "Unban player", "Exit") 
			if a == 1 then 
				say("Name of player who you wanna ban") 
				say("") 
				say("Info : Abusing GM power and you will be removed") 
				local cblock = input() 
				say("Reason:") 
				local creason = input() 
				game.set_event_flag("banned_".. cblock ..(),1") 
				notice_all("Player: ".. cblock .." is banned. reason: ".. creason.."") 
				notice_all("<ATTENTION>Play by the rules!!") 
			elseif a == 2 then 
				say("Insert name of player who will be unbanned") 
				local cublock = input() 
				game.set_event_flag("banned_".. culock ..(),0") 
				notice_all("Ban for player: ".. cublock .." was removed") 
			else then return end 
		end  
    end 
end