Why iPhone app crash on device, not on simulator?

I'm developing an iPhone app that uses third party libraries (openEars in specific) and I'm experiencing an issue when running it on the device (iPhone 4 with 5.0.1). The application works fine on the simulator but always crash at the same point when running on device. This is the crash log:

Incident Identifier: C3DCA230-EB1F-4C18-B173-320891E72311
CrashReporter Key:   ce8502e348826e9421531d69f8ca9abdf633c92b
Hardware Model:      iPhone3,1
Process:         OneTwoThree [29800]
Path:            /var/mobile/Applications/09D84DFC-DC52-43E6-AE72-EB28A73B4C22/OneTwoThree.app/OneTwoThree
Identifier:      OneTwoThree
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2012-02-04 16:22:42.407 +0100
OS Version:      iPhone OS 5.0.1 (9A405)
Report Version:  104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000001c
Crashed Thread:  3

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0:
0   libsystem_kernel.dylib          0x36297010 0x36296000 + 4112
1   libsystem_kernel.dylib          0x36297206 0x36296000 + 4614
2   CoreFoundation                  0x3436041c 0x342d3000 + 578588
3   CoreFoundation                  0x3435f11a 0x342d3000 + 573722
4   CoreFoundation                  0x342e24d6 0x342d3000 + 62678
5   CoreFoundation                  0x342e239e 0x342d3000 + 62366
6   GraphicsServices                0x30b66fc6 0x30b63000 + 16326
7   UIKit                           0x3776373c 0x37732000 + 202556
8   OneTwoThree                     0x000686d0 main (main.m:15)
9   OneTwoThree                     0x0001c9c4 start + 32

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib          0x362973b4 0x36296000 + 5044
1   libdispatch.dylib               0x36fc1e78 0x36fb5000 + 52856
2   libdispatch.dylib               0x36fc1b96 0x36fb5000 + 52118

Thread 2 name:  WebThread
Thread 2:
0   libsystem_kernel.dylib          0x36297010 0x36296000 + 4112
1   libsystem_kernel.dylib          0x36297206 0x36296000 + 4614
2   CoreFoundation                  0x3436041c 0x342d3000 + 578588
3   CoreFoundation                  0x3435f154 0x342d3000 + 573780
4   CoreFoundation                  0x342e24d6 0x342d3000 + 62678
5   CoreFoundation                  0x342e239e 0x342d3000 + 62366
6   WebCore                         0x367b6128 0x3670e000 + 688424
7   libsystem_c.dylib               0x33132c16 0x33123000 + 64534
8   libsystem_c.dylib               0x33132ad0 0x33123000 + 64208

Thread 3 Crashed:
0   OneTwoThree                     0x0009837e ps_start_utt (pocketsphinx.c:620)
1   OneTwoThree                     0x00086626 -[ContinuousModel listeningLoopWithLanguageModelAtPath:dictionaryAtPath:languageModelIsJSGF:] (ContinuousModel.mm:858)
2   OneTwoThree                     0x00087f30 -[PocketsphinxController startVoiceRecognitionThreadAutoreleasePoolWithArray:] (PocketsphinxController.mm:181)
3   Foundation                      0x35ce2a8a 0x35cd2000 + 68234
4   Foundation                      0x35d7659a 0x35cd2000 + 673178
5   libsystem_c.dylib               0x33132c16 0x33123000 + 64534
6   libsystem_c.dylib               0x33132ad0 0x33123000 + 64208

Thread 4 name:  AURemoteIO::IOThread
Thread 4:
0   libsystem_kernel.dylib          0x36297010 0x36296000 + 4112
1   libsystem_kernel.dylib          0x36297206 0x36296000 + 4614
2   AudioToolbox                    0x355ba48a 0x354fb000 + 783498
3   AudioToolbox                    0x355be0ae 0x354fb000 + 798894
4   AudioToolbox                    0x354fcaac 0x354fb000 + 6828
5   libsystem_c.dylib               0x33132c16 0x33123000 + 64534
6   libsystem_c.dylib               0x33132ad0 0x33123000 + 64208

Thread 3 crashed with ARM Thread State:
    r0: 0x00000000    r1: 0x00000000      r2: 0x000000a0      r3: 0x000000fc
    r4: 0x00000000    r5: 0x00000000      r6: 0x2ff67a28      r7: 0x2ff679f0
    r8: 0x002b6420    r9: 0x08e80b22     r10: 0x002a18d0     r11: 0x000dbe60
    ip: 0x2ff6ae5c    sp: 0x2ff679d0      lr: 0x0008662d      pc: 0x0009837e
  cpsr: 0x40000030

Binary Images:
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0x36296000 - 0x362acfff  libsystem_kernel.dylib armv7  <afd3cb06e20336dca2e5a6e11d080504> /usr/lib/system/libsystem_kernel.dylib
0x362ad000 - 0x362b9fff  CoreVideo armv7  <474c89eb09fe3464851a20d76052341b> /System/Library/Frameworks/CoreVideo.framework/CoreVideo
0x362ba000 - 0x3633dfff  CoreMotion armv7  <f4365ff3974b3049b3f04b3f55a46ae6> /System/Library/Frameworks/CoreMotion.framework/CoreMotion
0x363a0000 - 0x363a2fff  MobileInstallation armv7  <4ccf76f0e6cb3cd7b4e0087c2f284a1d> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation
0x36522000 - 0x36562fff  libGLImage.dylib armv7  <9440420d838a382caa175399d74a5044> /System/Library/Frameworks/OpenGLES.framework/libGLImage.dylib
0x36563000 - 0x3660dfff  libBLAS.dylib armv7  <9aabff01422f3cb8960f93d11d2b6de1> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib
0x3660e000 - 0x366fcfff  libiconv.2.dylib armv7  <6e858938edb93162ba8cf25702f08b16> /usr/lib/libiconv.2.dylib
0x3670e000 - 0x36ec5fff  WebCore armv7  <7137e0ea008f3a3e8ae9e57f96d34d1d> /System/Library/PrivateFrameworks/WebCore.framework/WebCore
0x36f6b000 - 0x36f6bfff  libkeymgr.dylib armv7  <791bb8b832943b2392c0c35228f52e09> /usr/lib/system/libkeymgr.dylib
0x36f86000 - 0x36f9afff  PersistentConnection armv7  <81eb1b3e08cf3d7196313307ad60649d> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection
0x36fb5000 - 0x36fcbfff  libdispatch.dylib armv7  <defe319d1f4d3c1c8c4f18ebd96b396a> /usr/lib/system/libdispatch.dylib
0x36feb000 - 0x370a6fff  AVFoundation armv7  <c971a925b82934f8881283aabb2992f5> /System/Library/Frameworks/AVFoundation.framework/AVFoundation
0x371e2000 - 0x3721dfff  libCGFreetype.A.dylib armv7  <753daf497ca736739a30126661a522f1> /System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib
0x3723e000 - 0x3723efff  liblangid.dylib armv7  <342170169bf232a0888912f5ef97112d> /usr/lib/liblangid.dylib
0x3723f000 - 0x37288fff  AddressBook armv7  <0a858565acd03f28a1bc69a650b64a7b> /System/Library/Frameworks/AddressBook.framework/AddressBook
0x372a3000 - 0x372a7fff  IOSurface armv7  <0f003f50b18e3dbf87607d819e0ac6b9> /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface
0x3756f000 - 0x37579fff  libbz2.1.0.dylib armv7  <28583efb9f1b38e7ae83c667b07dbd08> /usr/lib/libbz2.1.0.dylib
0x375b4000 - 0x375bafff  MobileIcons armv7  <2f4c13053206306996726629b0b7eb01> /System/Library/PrivateFrameworks/MobileIcons.framework/MobileIcons
0x3767a000 - 0x37683fff  libMobileGestalt.dylib armv7  <bf8d7c30f11a393a8adf4c8277e65aa3> /usr/lib/libMobileGestalt.dylib
0x37684000 - 0x37731fff  libxml2.2.dylib armv7  <78462273eb5b38d1a0873b02f0e35e23> /usr/lib/libxml2.2.dylib
0x37732000 - 0x37bcbfff  UIKit armv7  <97b527cd6fba35c6bb39263e0f362223> /System/Library/Frameworks/UIKit.framework/UIKit
0x37bd1000 - 0x37c50fff  libsqlite3.dylib armv7  <af4718fee01734748c42f2214ab6883d> /usr/lib/libsqlite3.dylib
0x37c75000 - 0x37c84fff  OpenGLES armv7  <6d1afb451f50310895ec59864739e781> /System/Library/Frameworks/OpenGLES.framework/OpenGLES
0x37c85000 - 0x37c96fff  libxpc.dylib armv7  <7d49e385ee5d3e7eb08d06525abd6435> /usr/lib/system/libxpc.dylib
0x37c9f000 - 0x37ca2fff  libmacho.dylib armv7  <3237bc9c109e3354bc4b38b957243f31> /usr/lib/system/libmacho.dylib
0x37ca3000 - 0x37cdffff  AppSupport armv7  <de0c2fbb95f8383db43acfb44e9c66fe> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport
0x37d1c000 - 0x37d1cfff  libunwind.dylib armv7  <d21222aad8c93d6c9580f9bf47071946> /usr/lib/system/libunwind.dylib
0x37d31000 - 0x37dfafff  Celestial armv7  <c18e76311fc33016be930da83050b96d> /System/Library/PrivateFrameworks/Celestial.framework/Celestial

I'can't figure out what is the problem. Thanks in advance.

This could be due to the fact that while the simulator is case insensitive, the device is case sensitive. Googling can help you to find other Q&A related to your issue.

For example, if you have a viewController called AppViewController and a NIB file called AppView, this code works on the simulator, but not on the device:

AppViewController *appViewController = [[AppViewController alloc] initWithNibName:@"appView" bundle:nil];

(note appView instead of AppView)

Try to check any file access in your app.