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This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.ArrayList$	at com.bluelinelabs.conductor.ControllerHostedRouter.removeHost(SourceFile:50)	at com.bluelinelabs.conductor.Controller.removeViewReference(SourceFile:790)	at com.bluelinelabs.conductor.Controller.destroy(SourceFile:879)	at com.bluelinelabs.conductor.Controller.destroy(SourceFile:868)	at com.bluelinelabs.conductor.Backstack.pop(SourceFile:55)	at com.bluelinelabs.conductor.Backstack.popAll(SourceFile:74)	at com.bluelinelabs.conductor.Router.setRoot(SourceFile:238)	at