Terminating since there is no system app?

Has anyone been experiencing the error message "Terminating since there is no system app" lately in XCode?

I have a CoreAudio app (built with The Amazing Audio Engine framework) running on iOS 8.1 and XCode 6.1. Since XCode 6.1 (or/and iOS 8.1) my app randomly crashes (generally not long after starting to run) and my iPad displays a black screen with the white apple logo. Like the boot up screen but only for a few seconds. Then the ipad goes back to the locked screen.

The log windows says : "Terminating since there is no system app". No very helpful ;^(

Anyone is having the same issue? Thanks.