Right now I've got the same error and don't know how to handle it. But in my case I'm recording audio on the Apple Watch with AVAudioEngine. I minimized the app during recording and started 1sec timer. When timer fires, I'm getting interruption began event where I pause recording, when I stop timer's alarm, I have interruption end event with shouldResume and I'm trying to do AVAudioEngine.start(). That's where I have this error.