[Beckett]

Код:

CMD:stats2(playerid, params[])
{
    new string[128];
    format(string, sizeof(string), "Delivered loads: %d\nFlown loads: %d", APlayerData[playerid][StatsTruckerJobs], APlayerData[playerid][StatsPilotJobs]);
    ShowPlayerDialog(playerid,-1,DIALOG_STYLE_MSGBOX, string);
    return 1;
}

As far as I know the dialog ID can't be below 0.( you wrote -1)