[Keeboo13]

C:\Users\sawsaw\Desktop\SZR GTA ROLEPLAY\gamemodes\vwrp.pwn(4900) : error 004: function "ClearChatbox" is not implemented

I got this error^^^
With this Code
CODE:
public OnPlayerRequestClass(playerid, classid)
{
PlayerPlaySound(playerid, 1068, 0.0, 0.0, 0.0);
PlayerInfo[playerid][pModel] = Peds[classid][0];

if (RegistrationStep[playerid] == 0 && gPlayerLogged[playerid] != 1)
{
ClearChatbox(playerid, 10);
SendClientMessage(playerid, COLOR_GREEN, " ~ Welcome to Los Santos Roleplay! ~");
SendClientMessage(playerid, COLOR_RED, " Visit Our Forums LosSantosRolePlay.forumotion.com! ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
SendClientMessage(playerid, COLOR_YELLOW2, " ");
if (gPlayerAccount[playerid] != 0)
{