kMIDIUnknownError The system can’t perform the requested operation. Declarationvar kMIDIUnknownError: OSStatus { get } See AlsoError CodeskMIDIInvalidClientkMIDIInvalidPortkMIDIWrongEndpointTypekMIDINoConnectionkMIDIUnknownEndpointkMIDIUnknownPropertykMIDIWrongPropertyTypekMIDINoCurrentSetupkMIDIMessageSendErrkMIDIServerStartErrkMIDISetupFormatErrkMIDIWrongThreadkMIDIObjectNotFoundkMIDIIDNotUniquekMIDINotPermitted