[Twisted_Insane]

It isn't necessary here, I just tested it and it worked, that's why I told him that it'll work for 100 percent!

Well, if it won't work for him:

pawn Код:

public OnPlayerCommandPerformed(playerid, cmdtext[], success)
{
    if(!success)
    {
        new string[128];
        format(string, sizeof(string), "Command %s doesn't exist, please type /help for all the available commands!", cmdtext);
        SendClientMessage(playerid, -1, string);
    }
    return 1;
}