UIApplicationMain的EXC_BAD_ACCESS-如何解释此回溯？

#0  0x0149609b in objc_msgSend ()
#1  0x06a75960 in ?? ()
#2  0x0108df9a in _performRunLoopAction ()
#3  0x0131189b in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ ()
#4  0x012a66e7 in __CFRunLoopDoObservers ()
#5  0x0126f1d7 in __CFRunLoopRun ()
#6  0x0126e840 in CFRunLoopRunSpecific ()
#7  0x0126e761 in CFRunLoopRunInMode ()
#8  0x01c871c4 in GSEventRunModal ()
#9  0x01c87289 in GSEventRun ()
#10 0x00393c93 in UIApplicationMain ()
#11 0x00001f68 in main (argc=1, argv=0xbffff028) at /Users/Stu/Documents...