Board Thread:Questions and Answers/@comment-27979501-20160314194449/@comment-11372432-20160315031654

This is what I have from http://idolish-seven.tumblr.com/ :

About Error [FE11204] We’ve been getting a lot of messages about this but unfortunately as neither of us mods are part of support or have gotten this error ourselves, there’s nothing we can really do about it. The message itself is just basically saying that a system error has occurred and to restart the application.

The only thing we can really suggest is to either restart your phone, completely reinstall the app (but make sure you have your transfer code ready just in case!) or contact support. Sorry we can’t do anything more to help!

-Mod Danielle

Basically, some are getting the error and some aren't. Presumably the staff are trying to fix it. Sorry if this doesn't help, but it is the best anyone really has to give in regards to advice.