I have the same problem. The speech recognizer can not work under the background mode. Did you solve the problem?

brew install svn

Ok, the problem is solved. As OOPer said Subversion is removed from macOS or Xcode Command Line tools. So brew install svn.

Hello everyone, This is an iOS system bug with Apple. The problem has been resolved by Apple. Appears in Version 12.0 beta (12A6159). Resolved in Version 12.0 beta 2 (12A6163b) by Apple. Next: Update Xcode and test again. Thanks.

The error log: [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x6000032144c0> F8BB1C28-BAE8-11D6-9C31-00039315CD46 HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range [aqme] 255: AQDefaultDevice (1): output stream 0: null buffer [aqme] 1778: EXCEPTION thrown (-50): error != 0 Initialize: Mach message timeout. Apparently deadlocked. Aborting now. CoreSimulator 725.10 - Device: iPhone 11 (003A9CF3-FDD7-4C44-8607-CAB3FDBB904B) - Runtime: iOS 14.0 (18A5301v) - DeviceType: iPhone 11 (lldb) bt thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT   frame #0: 0x00007fff215a233a libsystem_kernel.dylib`__pthread_kill + 10   frame #1: 0x00007fff215d7e60 libsystem_pthread.dylib`pthread_kill + 430   frame #2: 0x00007fff200c7c24 libsystem_c.dylib`abort + 120   frame #3: 0x00000001082ce5c9 AudioToolboxCore`_ReportRPCTimeout(char const*, int) + 90   frame #4: 0x0000000130cffbd9 libEmbeddedSystemAUs.dylib`_CheckRPCError(char const*, int, int) + 92   frame #5: 0x0000000130cfc4e0 libEmbeddedSystemAUs.dylib`AURemoteIO::Initialize() + 1878   frame #6: 0x0000000130d15ec6 libEmbeddedSystemAUs.dylib`AUBase::DoInitialize() + 36   frame #7: 0x0000000130c9c47f libEmbeddedSystemAUs.dylib`AUMethodInitialize(void*) + 59   frame #8: 0x00000001083c31bb AudioToolboxCore`-[AUAudioUnitV2Bridge allocateRenderResourcesAndReturnError:] + 77   frame #9: 0x0000000105aa0dbf AVFAudio`AUInterfaceBaseV3::Initialize() + 45   frame #10: 0x0000000105a8b90f AVFAudio`AVAudioIONodeImpl::GetInputFormat(unsigned long) + 125   frame #11: 0x0000000105a8b5d3 AVFAudio`AVAudioIONodeImpl::SetOutputFormat(unsigned long, AVAudioFormat*) + 571   frame #12: 0x0000000105a86022 AVFAudio`-[AVAudioNode setOutputFormat:forBus:] + 70   frame #13: 0x0000000105a9d1e3 AVFAudio`AVAudioEngineImpl::UpdateInputNode(bool) + 921   frame #14: 0x0000000105a98fd8 AVFAudio`-[AVAudioEngine inputNode] + 88frame #15: 0x0000000102c64391 iOS14Demo`-[MMSpeechRecognizer startAudioEngine](self=0x0000600002777c40, _cmd="startAudioEngine") at MMSpeechRecognizer.m:72:56  frame #16: 0x0000000102c651fd iOS14Demo`-[MMSpeechRecognizer start](self=0x0000600002777c40, _cmd="start") at MMSpeechRecognizer.m:175:13   frame #17: 0x0000000102c63929 iOS14Demo`-[ViewController siriBtnClick:](self=0x00007f8dda60b650, _cmd="siriBtnClick:", sender=0x00007f8ddb80b3a0) at ViewController.m:66:9   frame #18: 0x0000000114403f15 UIKitCore`-[UIApplication sendAction:to:from:forEvent:] + 83   frame #19: 0x0000000113d5da2a UIKitCore`-[UIControl sendAction:to:forEvent:] + 223   frame #20: 0x0000000113d5dd4d UIKitCore`-[UIControl _sendActionsForEvents:withEvent:] + 332   frame #21: 0x0000000113d5c636 UIKitCore`-[UIControl touchesEnded:withEvent:] + 500   frame #22: 0x000000011443f389 UIKitCore`-[UIWindow _sendTouchesForEvent:] + 1287   frame #23: 0x00000001144411ea UIKitCore`-[UIWindow sendEvent:] + 4750   frame #24: 0x000000011441b39d UIKitCore`-[UIApplication sendEvent:] + 428   frame #25: 0x00000001144aabb1 UIKitCore`__processEventQueue + 14793   frame #26: 0x00000001144a175f UIKitCore`__eventFetcherSourceCallback + 106   frame #27: 0x00000001034f18bc CoreFoundation`CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17   frame #28: 0x00000001034f17fb CoreFoundation`__CFRunLoopDoSource0 + 157   frame #29: 0x00000001034f0f3f CoreFoundation`__CFRunLoopDoSources0 + 222   frame #30: 0x00000001034eba20 CoreFoundation`__CFRunLoopRun + 882   frame #31: 0x00000001034eb2fa CoreFoundation`CFRunLoopRunSpecific + 538   frame #32: 0x00000001081ebdb3 GraphicsServices`GSEventRunModal + 139   frame #33: 0x00000001143fd942 UIKitCore`-[UIApplication _run] + 912   frame #34: 0x0000000114402f62 UIKitCore`UIApplicationMain + 1570   frame #35: 0x0000000102c660ca iOS14Demo`main(argc=1, argv=0x00007ffeecf9bc80) at main.m:17:12   frame #36: 0x00007fff20222941 libdyld.dylib`start + 1 (lldb)