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I have the same error trying to run an app with an AVAudioEngine defined in a global variable.The message is printed when I try to access to self.inputNode in the (overridden) AVAudioEngine (created in Objective-C). When I print the description I have :AVAudioEngineGraph 0x101a14460: initialized = 0, running = 0, number of nodes = 0after I instantiated the AVAudioEngine with [[AVAudioEngine alloc] init].Can anyone help ?