[Biesmen]

pawn Код:

format(file, 256, "\\Users\\%s.ini", name);

Are you using linux? If yes, keep it like that.
If no change it to

pawn Код:

format(file, 256, "\Users\%s.ini", name);

or

pawn Код:

format(file, 256, "Users\%s.ini", name);

For the login check, use this:

pawn Код:

public OnPlayerRequestSpawn(playerid)
{
      if(logged[playerid] == 1) {
      return 1;
} else {
      SendClientMessage(playerid, 0xFF0000AA, "ERROR: You're not logged in!");
      return 0;
        }
}