[Ecstacy]

i get this error when i want to compile it as filter script :
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn(1) : warning 235: public function lacks forward declaration (symbol "OnPlayerCommandText")
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn(3) : error 017: undefined symbol "strcmp"
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn(5) : error 017: undefined symbol "IsPlayerAdmin"
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn(7) : error 017: undefined symbol "Audio_SetPack"
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn( : error 017: undefined symbol "MAX_PLAYERS"
C:\Users\sina\Desktop\stunt world\filterscripts\mp3.pwn(9) : error 017: undefined symbol "Audio_Play"
Pawn compiler 3.2.3664 Copyright © 1997-2006, ITB CompuPhase


5 Errors.