public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(PRESSED(KEY_FIRE)) {
        if(GetPlayerWeapon(playerid) == 4) {
            new
                Float:X,
                Float:Y,
                Float:Z,
                Float:hp;
            GetPlayerPos(playerid, X, Y, Z);
            foreach(Player, i)
            {
                if ( gTeam [ playerid ] == gTeam [ i ] )
                else
                {
                    if(IsPlayerInRangeOfPoint(playerid, 2.0, X, Y, Z))
                    {

                        GetPlayerHealth(i, hp);
                        SetPlayerHealth(i, hp-5.0);
                    }
                }
            }
        }
    }
    return 1;
}

ERROR:

C:\Users\GM\Desktop\SA-MP\gamemodes\zom.pwn(451) : error 029: invalid expression, assumed zero
Pawn compiler 3.2.3664	 	 	Copyright (c) 1997-2006, ITB CompuPhase


1 Error.


LINE 451: else