Strange Xcode Error for iOS? YS Bundle Null Exception

The game works perfectly built in Unity and previously worked when built as well. However, now, when I build it in Xcode I get a null exception for something called "YS Bundle", and the game is stuck on the Unity splash screen.

[EDIT:] The game starts up just fine as long as it isn't started in Xcode. So once it's built it runs from tapping on the app. If run from Xcode it throws the error. This wouldn't be a big problem except now the game is lagging something fierce and I can't debug it in Xcode with this error.

Why am I getting a null exception for the YS Bundle? What is the YS Bundle anyway? Any and all help and insight is very much appreciated.

This is the entirety of my debug log from Xcode:

 2014-10-12 19:47:27.087 REPLACEDPRODUCT[665:60b] YS Bundle: com.REPLACEDCOMPANY.REPLACEDPRODUCT
 2014-10-12 19:47:27.379 sh[674:303] YS Bundle: (null)
 CoreFoundation = 847.210000

I originally thought the error was being caused by a plugin. But after I removed Prime31, the problem persisted.