[Mattakil]

pawn Код:

if(strcmp(cmd, "/help", true) == 0)
    {
        if(GetPVarInt(playerid, "Logged") == 0)
        {
            SendClientMessage(playerid, COLOR_LIGHTRED, "You are not logged in!");
            return 1;
        }
        ShowPlayerDialog(playerid,11,DIALOG_STYLE_MSGBOX,"Help","/buylevel /stats /help /kill /class /blockpm /g /pm","Okay","");
        return 1;
    }

ShowPlayerDialog should be done like this

pawn Код:

else
   {
    ShowPlayerDialog(blablabla);
    return 1;
    }

I reckon using ZCMD, as its just easier. If you want, PM me your code and I'll fix the errors and change to zcmd.