AU Lab won't save settings

When i try to save AU Lab settings to a file nothing happens.

Additionally, when i run AU Lab from terminal i get this error when saving:

G**********s-MacBook-Pro-2:MacOS **************$ ./AU\ Lab ~/Documents/GST2.trak

2015-12-15 15:39:08.215 AU Lab[1067:18901] AggregateDeviceForDevices- unabled to set sample rate to 96000.000000

2015-12-15 15:39:08.239 AU Lab[1067:18901] 15:39:08.239 ERROR: AudioUnitGraph.cpp:2941: DoMakeDisconnection: DoMakeDisconnection failed with error -10860

2015-12-15 15:39:13.941 AU Lab[1067:18901] AggregateDeviceForDevices- unabled to set sample rate to 96000.000000

After i tried to save:

2015-12-15 15:39:44.010 AU Lab[1067:18901] An uncaught exception was raised

2015-12-15 15:39:44.010 AU Lab[1067:18901] *** setObjectForKey: object cannot be nil (key: Aggregate Output UID)

2015-12-15 15:39:44.025 AU Lab[1067:18901] (

0 CoreFoundation 0x00007fff9917e03c __exceptionPreprocess + 172

1 libobjc.A.dylib 0x00007fff8d1b076e objc_exception_throw + 43

2 CoreFoundation 0x00007fff99064c66 -[__NSDictionaryM setObject:forKey:] + 1174

3 AU Lab 0x00000001010aed98 -[DocumentData dictionaryRepresentation] + 696

4 AU Lab 0x00000001010a8733 -[TrackDocument writeToFile:ofType:] + 43

5 AppKit 0x00007fff8e8eebcd -[NSDocument writeToURL:ofType:error:] + 126

6 AppKit 0x00007fff8e8eeb03 -[NSDocument writeToURL:ofType:forSaveOperation:originalContentsURL:error:] + 494

7 AppKit 0x00007fff8e8ee0c7 -[NSDocument _writeSafelyToURL:ofType:forSaveOperation:forceTemporaryDirectory:error:] + 894

8 AppKit 0x00007fff8e8edd33 -[NSDocument _writeSafelyToURL:ofType:forSaveOperation:error:] + 28

9 AppKit 0x00007fff8e8ed8d1 -[NSDocument writeSafelyToURL:ofType:forSaveOperation:error:] + 357

10 AppKit 0x00007fff8ea2f9d4 __66-[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_22353 + 223

11 AppKit 0x00007fff8ea2f8e6 __66-[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke2350 + 365

12 AppKit 0x00007fff8ea2dd04 __66-[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke_22222 + 1715

13 Foundation 0x00007fff90aed584 __110-[NSFileCoordinator(NSPrivate) _coordinateReadingItemAtURL:options:writingItemAtURL:options:error:byAccessor:] _block_invoke428 + 301

14 Foundation 0x00007fff9092edf9 -[NSFileCoordinator(NSPrivate) _invokeAccessor:orDont:andRelinquishAccessClaim:] + 351

15 Foundation 0x00007fff90aed177 -[NSFileCoordinator(NSPrivate) _coordinateReadingItemAtURL:options:writingItemAtURL:options:error:byAccessor:] + 944

16 AppKit 0x00007fff8ea29d0c -[NSDocument _fileCoordinator:coordinateReadingContentsAndWritingItemAtURL:byAccessor:] + 241

17 AppKit 0x00007fff8e8ece85 -[NSDocument _fileCoordinator:asynchronouslyCoordinateReadingContentsAndWritingItemAtURL:byA ccessor:] + 150

18 AppKit 0x00007fff8ea2d636 __66-[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke2221 + 307

19 AppKit 0x00007fff8ea2cc99 -[NSDocument _prepareToSaveToURL:forSaveOperation:completionHandler:] + 212

20 AppKit 0x00007fff8e8ecc01 __66-[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:]_block_invoke + 443

21 AppKit 0x00007fff8e6f8c89 -[NSDocument continueFileAccessUsingBlock:] + 222

22 AppKit 0x00007fff8e89a8dd -[NSDocument _performFileAccessOnMainThread:usingBlock:] + 762

23 AppKit 0x00007fff8e6f8827 -[NSDocument performAsynchronousFileAccessUsingBlock:] + 484

24 AppKit 0x00007fff8e8ec947 -[NSDocument saveToURL:ofType:forSaveOperation:completionHandler:] + 148

25 AppKit 0x00007fff8e9431af __85-[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke_2 + 296

26 AppKit 0x00007fff8e8a2eca -[NSDocument _commitEditingThenContinue:] + 495

27 AppKit 0x00007fff8e8a2ccd -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 138

28 AppKit 0x00007fff8e943075 __85-[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:]_block_ invoke + 510

29 AppKit 0x00007fff8e6f5202 -[NSDocument performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 61

30 AppKit 0x00007fff8e942e68 -[NSDocument saveToURL:ofType:forSaveOperation:delegate:didSaveSelector:contextInfo:] + 169

31 AppKit 0x00007fff8ea269bb __67-[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:]_block_invoke_31485 + 213

32 AppKit 0x00007fff8e8a296a -[NSDocument continueActivityUsingBlock:] + 323

33 AppKit 0x00007fff8ea268d9 __67-[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:]_block_invoke_21482 + 265

34 AppKit 0x00007fff8ea2647c -[NSDocument _checkForFileChangesThenSave:saveAs:orCancel:] + 691

35 AppKit 0x00007fff8ea267c0 __67-[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:]_block_invoke1479 + 503

36 AppKit 0x00007fff8ea4af02 -[NSDocument _checkAutosavingIgnoringSafetyChecksThenContinue:] + 119

37 AppKit 0x00007fff8e9002b5 __67-[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:]_block_invoke_2 + 498

38 AppKit 0x00007fff8e8a2eca -[NSDocument _commitEditingThenContinue:] + 495

39 AppKit 0x00007fff8e8a2ccd -[NSDocument _commitEditingWithDelegate:didSomethingSelector:contextInfo:thenContinue:] + 138

40 AppKit 0x00007fff8e900064 __67-[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:]_block_invoke + 353

41 AppKit 0x00007fff8e6f5202 -[NSDocument performActivityWithSynchronousWaiting:usingBlock:cancellationHandler:] + 61

42 AppKit 0x00007fff8e8ffef6 -[NSDocument saveDocumentWithDelegate:didSaveSelector:contextInfo:] + 128

43 libsystem_trace.dylib 0x00007fff935bacd7 _os_activity_initiate + 75

44 AppKit 0x00007fff8e72feb1 -[NSApplication sendAction:to:from:] + 452

45 AppKit 0x00007fff8e72fc4e -[NSMenuItem _corePerformAction] + 382

46 AppKit 0x00007fff8e72f97c -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 114

47 libsystem_trace.dylib 0x00007fff935bacd7 _os_activity_initiate + 75

48 AppKit 0x00007fff8e7f6b00 -[NSMenu performActionForItemAtIndex:] + 131

49 AppKit 0x00007fff8e7f6a66 -[NSMenu _internalPerformActionForItemAtIndex:] + 35

50 AppKit 0x00007fff8e7f68b2 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 107

51 AppKit 0x00007fff8e717d6b NSSLMMenuEventHandler + 724

52 HIToolbox 0x00007fff9c1b6b6c _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1260

53 HIToolbox 0x00007fff9c1b5fae _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14H andlerCallRec + 386

54 HIToolbox 0x00007fff9c1cbcb6 SendEventToEventTarget + 40

55 HIToolbox 0x00007fff9c205f45 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueE ventRef + 428

56 HIToolbox 0x00007fff9c243b8d SendMenuCommandWithContextAndModifiers + 59

57 HIToolbox 0x00007fff9c243b30 SendMenuItemSelectedEvent + 188

58 HIToolbox 0x00007fff9c243a09 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 96

59 HIToolbox 0x00007fff9c244481 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 702

60 HIToolbox 0x00007fff9c2440fe _HandleMenuSelection2 + 446

61 AppKit 0x00007fff8e635ce0 _NSHandleCarbonMenuEvent + 277

62 AppKit 0x00007fff8e56cbfd _DPSNextEvent + 1828

63 AppKit 0x00007fff8e56be58 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 346

64 AppKit 0x00007fff8e561af3 -[NSApplication run] + 594

65 AppKit 0x00007fff8e4de244 NSApplicationMain + 1832

66 AU Lab 0x0000000101063048 start + 52

)