Xcode SIGABRT

Program received signal:  “SIGABRT”.
(gdb) thread apply all bt

Thread 2 (process 829):
#0  0x0000000100032ca2 in kevent ()
#1  0x00000001000350b6 in _dispatch_mgr_invoke ()
#2  0x000000010003485f in _dispatch_queue_invoke ()
#3  0x00000001001b7adc in _dispatch_continuation_pop ()
#4  0x0000000100034433 in _dispatch_worker_thread2 ()
#5  0x0000000100033d6b in _pthread_wqthread ()
#6  0x0000000100033b39 in start_wqthread ()

Thread 1 (process 829):
#0  0x0000000100070912 in __kill ()
#1  0x0000000100070904 in kill ()
#2  0x0000000100136f1c in raise ()
#3  0x0000000100160aef in abort ()
#4  0x00000001001b80e2 in _dispatch_abort ()
#5  0x0000000100050315 in dispatch_source_set_cancel_handler ()
#6  0x00007fff80f79fff in ___CFMachPortCreateWithPort2_block_invoke_1 ()
#7  0x000000010004f814 in dispatch_barrier_sync_f ()
#8  0x000000010004f66f in dispatch_sync_f ()
#9  0x000000010004f63c in dispatch_sync ()
#10 0x00007fff80f79cf9 in _CFMachPortCreateWithPort2 ()
#11 0x00007fff80f79b5b in CFMachPortCreate ()
#12 0x00007fff80f799b1 in _CFXNotificationCenterCreate ()
#13 0x00007fff80f7985b in _CFXNotificationGetHostCenter ()
#14 0x00007fff80f79652 in __CFXPreferencesGetSourceForTriplet ()
#15 0x00007fff80f76c69 in __CFXPreferencesGetSearchListForBundleID ()
#16 0x00007fff80f76b1b in CFPreferencesCopyAppValue ()
#17 0x00007fff810c05ef in -[NSUserDefaults(NSUserDefaults) initWithUser:] ()
#18 0x00007fff810c00c3 in +[NSUserDefaults(NSUserDefaults) standardUserDefaults] ()
#19 0x00007fff818e2561 in +[NSApplication initialize] ()
#20 0x00007fff84066535 in _class_initialize ()
#21 0x00007fff8407463e in prepareForMethodLookup ()
#22 0x00007fff8406ceaa in lookUpMethod ()
#23 0x00007fff840651ba in objc_msgSend ()
#24 0x00007fff818e23e6 in NSApplicationMain ()
#25 0x0000000100000f35 in main (argc=1, argv=0x7fff5fbfe860) at main.m:13