Any iPhone master Please tell me the reason for my app crash here is my Log?
<p>i am doing Tab application in iPhone with four tabs.
    my app almost completed but while app running some times it is crashing.i observed that issue raising while i am switching between two view's like front and back in navigation.any iPhone master please help me to resolve this?</p>

<pre><code>## Log ##  
   Mon Jul 16 21:07:55 unknown MyApp[167] &lt;Warning&gt;: NVVC Dealloc 
    Mon Jul 16 21:08:23 unknown com.apple.launchd[1] &lt;Notice&gt;: (UIKitApplication:com.company.MyApp[0xe271]) Bug: launchd_core_logic.c:2688 (24132):10 
    Mon Jul 16 21:08:23 unknown com.apple.launchd[1] &lt;Notice&gt;: (UIKitApplication:com.company.MyApp[0xe271]) Working around 5020256. Assuming the job crashed. 
    Mon Jul 16 21:08:23 unknown com.apple.launchd[1] &lt;Warning&gt;: (UIKitApplication:com.company.MyApp[0xe271]) Job appears to have crashed: Segmentation 
    fault 
    Mon Jul 16 21:08:23 unknown SpringBoard[29] &lt;Warning&gt;: Application 'MyApp' exited abnormally with signal 11: Segmentation fault 
    Mon Jul 16 21:09:04 unknown lockdownd[20] &lt;Error&gt;: (0x403000) handle_connection: Could not receive USB message #7 from Xcode. Killing connection 
    Mon Jul 16 22:00:39 unknown com.apple.launchd[1] &lt;Notice&gt;: (UIKitApplication:com.apple.mobilemail[0x55fb]) Exited: Killed 
    Mon Jul 16 22:00:39 unknown com.apple.launchd[1] &lt;Notice&gt;: (UIKitApplication:com.apple.mobilephone[0xa13c]) Exited: Killed 
    Mon Jul 16 22:00:39 unknown com.apple.launchd[1] &lt;Notice&gt;: (UIKitApplication:com.MyApp.app[0x137]) Exited: Killed 
    Mon Jul 16 22:00:39 unknown com.apple.launchd[1] &lt;Notice&gt;: (com.apple.accessoryd) Exited: Killed 
    Mon Jul 16 22:00:41 unknown SpringBoard[29] &lt;Warning&gt;: Application 'Mail' exited abnormally with signal 9: Killed 
    Mon Jul 16 22:00:41 unknown SpringBoard[29] &lt;Warning&gt;: Memory level is not normal (15%). Delaying auto-relaunch of 'Mail' for 30 seconds. Mon Jul 16 22:00:41 unknown SpringBoard[29] &lt;Warning&gt;: Application 'app' exited abnormally with signal 9: Killed 
    Mon Jul 16 22:00:42 unknown SpringBoard[29] &lt;Warning&gt;: Application 'Phone' exited abnormally with signal 9: Killed 
</code></pre>
