QUEST ERRORRRRRR NPC. "ALL FUNCTION" = NILL .... IT'S A CRITICAL ERROR

Please help me!

Syserr:

SYSERR: Mar 29 13:35:42 :: RunState: LUA_ERROR: [string "ballo"]:1: attempt to call field `open_shop' (a nil value)
SYSERR: Mar 29 13:35:42 :: WriteRunningStateToSyserr: LUA_ERROR: quest ballo.start click

and the shop doesn't show!

:)))))))))) FIXXXXXXXXX

Change the name of npc.quest to npc_.quest

post the quest ballo here