Pomoc !Kako da rijesim ovo

C:\Documents and Settings\Admin\Desktop\ForteX RP\gamemodes\ForteX RP.pwn(3973) : error 017: undefined symbol "IsAnInstructor"
C:\Documents and Settings\Admin\Desktop\ForteX RP\gamemodes\ForteX RP.pwn(9625) : error 017: undefined symbol "IsAnInstructor"
Pawn compiler 3.2.3664 Copyright (c) 1997-2006, ITB CompuPhase

2 Errors.

Dodaj ovo forward IsAnInstructor(playerid);