Mac OS version worked for days until now, not responding

[Gamefreak 0]

I've been playing the Mac OS version of Elysium with no problems for days now. All of a sudden, this morning, the WoW would not open, and eventually a window comes up saying " WoW quit unexpectedly". I'll open the app, my cursor turns to a loading icon, and then stops. If I click the WoW running app, nothing happens. After 15 seconds, the "WoW quit unexpectedly" comes up and the whole thing closes.

Anyone know how I can fix this? Thanks