[HyperZ]

Actually, you forgot to add Dialig Style, i've added Dialog Message Box you can change it if you want to change..
https://sampwiki.blast.hk/wiki/Dialog_Styles

Fixed Code:

pawn Код:

if(dialogid == 28)
{
    new p[256];
    p=LoadMem(playerid);
    ShowPlayerDialog(playerid, 29,DIALOG_STYLE_MSGBOX,"Members",p,"Ok", "Cancel");
}