[Drebin]

Show us the ClearChatbox(i) function.
Also, you can easily do it this way:

pawn Код:

CMD:clearchat(playerid, params[])
{
    if(PlayerInfo[playerid][pAdmin] >= 2)
    {
        for(new i = 0; i < 100; i++)
        SendClientMessageToAll(-1,"");
    }
    return 1;
    format(string, sizeof(string), "AdmCmd: %s has cleared all the chatbox.", GetPlayerNameEx(playerid);
    ABroadCast(COLOR_WHITE, string, 2);
}