[Seifspeed]

At first i posted it on ongamemodeinit it said:
D:\Users\Seif\Desktop\Raven's Roleplay\gamemodes\larp.pwn(23222) : error 017: undefined symbol "playerid"
D:\Users\Seif\Desktop\Raven's Roleplay\gamemodes\larp.pwn(23223) : error 017: undefined symbol "playerid"
D:\Users\Seif\Desktop\Raven's Roleplay\gamemodes\larp.pwn(23224) : error 017: undefined symbol "playerid"
D:\Users\Seif\Desktop\Raven's Roleplay\gamemodes\larp.pwn(23225) : error 017: undefined symbol "playerid"
Pawn compiler 3.2.3664 Copyright © 1997-2006, ITB CompuPhase

Then i posted it on onplayerconnect it said:

D:\Users\Seif\Desktop\Raven's Roleplay\gamemodes\larp.pwn(630 : error 021: symbol already defined: "RemoveBuildingForPlayer"
Pawn compiler 3.2.3664 Copyright © 1997-2006, ITB CompuPhase

Did i do something wrong didnt include something or define something?
i have this line on a_players:
native RemoveBuildingForPlayer(playerid, modelid, Float:fX, Float:fY, Float:fZ, Float:fRadius);
What else should i do?
And Whats a LOOP?