Board Thread:Questions and Answers/@comment-67.5.109.160-20151118020144/@comment-64.233.173.126-20160506041513

That would probably means there is no one playing nultiplayer when you went to lobby. I don't know if it still active or death since I haven't played it (need to make a master account because my current psn account got lock by parental control). But maybe this could help you. It is a list of someone who has played multiplayer.

http://www.gamefaqs.com/boards/859678-sword-art-online-lost-song/72061529