[Ironboy]

I want to do something in "OnPlayerKeyStateChange"
But i want a key like this..

pawn Код:

if(newkeys & KEY_HORN)

but it says

pawn Код:

C:\Documents and Settings\Ironboy\Desktop\Windows server\gamemodes\Paradise_City.pwn(2203) : error 017: undefined symbol "KEY_HORN"
Pawn compiler 3.2.3664          Copyright (c) 1997-2006, ITB CompuPhase


1 Error.

how to fix it? plz help me