[PrawkC]

pawn Код:

command(noteplayer, playerid, params[])
{
    new pid;
    new note[128];
    new string[128];
    
    if( PlayerInfo[playerid][Admin] >= 1)
    {
        if(sscanf(params, "is[128]", pid, note)) //You forgot to add the "s" , and the [128] is the size
        {
            SendClientMessage(playerid, COLOUR_ORANGE, "Hint: /noteplayer (playerid) (note)");
            return 1;
        }
        if(!IsPlayerConnected(pid))
        {
            SendClientMessage(playerid, COLOUR_ORANGE, "That player ID is not connected.");
            return 1;
        }
        format(string, sizeof(string), "~r %s",note);
        GameTextForPlayer(pid, string , 10000, 0); //You use the string we formatted for the text
    }
    return 1;
}

Untested, but should work.