Last Exception Backtrace: 0 CoreFoundation 0x188f765ac __exceptionPreprocess + 220 (NSException.m:199) 1 libobjc.A.dylib 0x19cff042c objc_exception_throw + 60 (objc-exception.mm:565) 2 CoreFoundation 0x188f75f04 __NSFastEnumerationMutationHandler + 124 (NSEnumerator.m:129) 3 CameraUI 0x1b1724178 -[CAMPriorityNotificationCenter _postNotification:forEntries:] + 264 (CAMPriorityNotificationCenter.m:83) 4 CameraUI 0x1b1723d74 -[CAMPriorityNotificationCenter _notificationReceiver:] + 460 (CAMPriorityNotificationCenter.m:127) 5 CoreFoundation 0x188ed5764 CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER + 28 (CFNotificationCenter.c:706) 6 CoreFoundation 0x188ed5718 ___CFXRegistrationPost_block_invoke + 52 (CFNotificationCenter.c:173) 7 CoreFoundation 0x188ed4cd4 _CFXRegistrationPost + 440 (CFNotificationCenter.c:198) 8 CoreFoundation 0x188ed46a0 _CFXNotificationPost + 704 (CFNotificationCenter.c:1071) 9 Foundation 0x18a1685f4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 (NSNotification.m:575) 10 CoreFoundation 0x188ef3564 CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 28 (CFRunLoop.c:1815) 11 CoreFoundation 0x188ef27b8 __CFRunLoopDoBlocks + 408 (CFRunLoop.c:1857) 12 CoreFoundation 0x188eed0ac __CFRunLoopRun + 1732 (CFRunLoop.c:3172) 13 CoreFoundation 0x188eec4bc CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242) 14 GraphicsServices 0x19f971820 GSEventRunModal + 164 (GSEvent.c:2259) 15 UIKitCore 0x18b890734 -[UIApplication _run] + 1072 (UIApplication.m:3270) 16 UIKitCore 0x18b895e10 UIApplicationMain + 168 (UIApplication.m:4739) 17 UBRValetApp 0x102462a00 main + 289280 (main.m:18) 18 libdyld.dylib 0x188bb3e60 start + 4