Hello, Tamers.

Sorry for the inconvenience.
After the latest update, we found that there is an error caused by some of resources not corresponding. (error code: 4)
This error is causing game client to shut down, so players are not able to play the game normally.
Currently, we're under investigation over this problem and will resolve the matter as soon as possible.
We'll put out further notice when it is resolved.
We apologize about the inconvenience once again.

The error code: 4 issue has been fixed. (05:00 PST standard)

Thank you.