Was soll das für ein Error sein?

}//Zeile 5544

return 0;//Zeile 5546
}

C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(4741) : error 017: undefined symbol "IsNumeric"//Anderer Error, anderes Thema
C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5544) : warning 209: function "OnPlayerPickUpPickup" should return a value
C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5546) : error 010: invalid function or declaration
Pawn compiler 3.2.3664 Copyright (c) 1997-2006, ITB CompuPhase

2 Errors.

else
{
SendClientMessage(playerid,COLOR_RED,"Du bist kein MultiDriver!");
}
}//Zeile 5553
return 1;//Zeile 5554
}

C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5553) : warning 209: function "OnPlayerPickUpPickup" should return a value
C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5554) : error 010: invalid function or declaration
Pawn compiler 3.2.3664 Copyright (c) 1997-2006, ITB CompuPhase

1 Error.

/EDIT: Falsche Zeile hierrein kopiert . -.- jetz ist richtig.^^

Das gleiche:C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5553) : warning 209: function "OnPlayerPickUpPickup" should return a value
C:\DOKUME~1\Vinni\Desktop\SAMP-S~1\Server\GAMEMO~1\PIPAPO~1.PWN(5554) : error 010: invalid function or declaration
Pawn compiler 3.2.3664 Copyright (c) 1997-2006, ITB CompuPhase

1 Error.