[Konstantinos]

Goto the main package of your server. The gamemode file must be in gamemodes folder. Goto pawno\include directory and paste the a_zones.inc file there. Make sure it's .inc and not any other such as .txt (I've seen that before by clicking download at pastebin). Go to the up folder and run pawno.exe
Browse to the main package server you used and get in the gamemodes folder. Open the file you use for the gamemode and re-compile.

EDIT: You just solved it.