[iggy1]

pawn Code:

public OnPlayerText(playerid, text[])
{
    new string[56];
    new PlayerName[MAX_PLAYER_NAME];
    for(new i; i<MAX_PLAYERS; i++)
    {
        new Float:XXX,Float:YYY,Float:ZZZ;
        GetPlayerPos(playerid, XXX, YYY, ZZZ);
        if(IsPlayerInRangeOfPoint(i, 25.0, XXX, YYY, ZZZ))
        {
            format(string, sizeof(string), "%s says: %s",PlayerName,text);
            SendClientMessage(i, 0xFF0000AA, string);
        }
    }
    return 1;
}

You had no opening brace after the 'for' loop.

EDIT: Removed bad advice.