iPhone App Crashing during navigation
<p>I have a tough problem (tough for me since I'm a newb.).  I have a table view app that I'm working on.  It starts with a table and you navigate down to a view controller.  In that view controller I'm using some sample code hooked into a button that will add a contact to the iPhone address book.</p>

<p>My problem is when the user navigates back to the table of data, the app crashes.  Is there any advice someone can provide?  Or, maybe someone I could send me code for review?</p>

<p>Update*</p>

<p>Here's the information from the console.</p>

<pre><code>[Session started at 2010-07-20 22:51:46 -0500.]
2010-07-20 22:51:49.621 Infinite Possibilities[5882:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSPlaceholderString initWithString:]: nil argument'
*** Call stack at first throw:
(
 0   CoreFoundation                      0x025ff919 __exceptionPreprocess + 185
 1   libobjc.A.dylib                     0x0274d5de objc_exception_throw + 47
 2   CoreFoundation                      0x025b8078 +[NSException raise:format:arguments:] + 136
 3   CoreFoundation                      0x025b7fea +[NSException raise:format:] + 58
 4   Foundation                          0x0006869c -[NSPlaceholderString initWithString:] + 105
 5   Infinite Possibilities              0x00003b90 -[RootViewController tableView:didSelectRowAtIndexPath:] + 3405
 6   UIKit                               0x0034c718 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140
 7   UIKit                               0x00342ffe -[UITableView _userSelectRowAtIndexPath:] + 219
 8   Foundation                          0x00059cea __NSFireDelayedPerform + 441
 9   CoreFoundation                      0x025e0d43 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
 10  CoreFoundation                      0x025e2384 __CFRunLoopDoTimer + 1364
 11  CoreFoundation                      0x0253ed09 __CFRunLoopRun + 1817
 12  CoreFoundation                      0x0253e280 CFRunLoopRunSpecific + 208
 13  CoreFoundation                      0x0253e1a1 CFRunLoopRunInMode + 97
 14  GraphicsServices                    0x02e642c8 GSEventRunModal + 217
 15  GraphicsServices                    0x02e6438d GSEventRun + 115
 16  UIKit                               0x002e8b58 UIApplicationMain + 1160
 17  Infinite Possibilities              0x00002834 main + 102
 18  Infinite Possibilities              0x000027c5 start + 53
)
terminate called after throwing an instance of 'NSException'
</code></pre>
