building adobe air native extension on iOS

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AS3

Xcode

I am trying to build my first adobe air extension on iOS. I have read many tutorials on adobe and everything seems fine, but when I run my project on a device, iPhone5 iOS7 it throws the following error in the organizer window

Oct 27 00:57:27 Default ReportCrash[100] : ReportCrash acting against PID 100
Oct 27 00:57:28 Default backboardd[28] : CoreAnimation: timed out fence 5a607
Oct 27 00:57:28 Default ReportCrash[100] : Formulating crash report for process Alert[100]
Oct 27 00:57:28 Default com.apple.launchd[1] (UIKitApplication:com.test.Vibration[0x4919][100]) : (UIKitApplication:com.test.Vibration[0x4919]) Job appears to have crashed: Segmentation fault: 11
Oct 27 00:57:28 Default backboardd[28] : Application 'UIKitApplication:com.test.Vibration[0x4919]' exited abnormally with signal 11: Segmentation fault: 11
Oct 27 00:57:28 Default ReportCrash[100] : Saved crashreport to /var/mobile/Library/Logs/CrashReporter/Alert_2013-10-27-095727_Default.plist using uid: 0 gid: 0, synthetic_euid: 501 egid: 0

my environment is: xcode: 4.6.3 Flex sdk combined with Air SDK: flex 4.6 - Air 3.5

the funny thing is that I downloaded files from one of adobe samples, the vibration sample and when I use their .a library and build the .ane from that .a it works perfectly fine, but when I try to generate my own .a file, the above error message is shown so there must be something wrong in building the .a library.

I really appreciate if someone could give me a hint to know where to look at? what's the problem?

Amin