If you are getting 10102, it means that your character is still logged in. To fix it, you can try logging in with a different character on a different world. I used a JP server to login and then out, then I exited the client and entered again. I got 10102 at first, but then started getting 1017.
Of course now the lobby servers are crashing, so I can't get any futher than that. But this might help you get out of the 10102 loop.