title: Terminating app due to uncaught exception 'NSUnknownKeyException'
body: <p>I'm using a tutorial to write a fairly simple app. I copied the app to my work computer today. It was working perfectly on my laptop last night, but today I get this error. I tried gutting nearly all of the code, and even deleted everything in the didFinishLaunchingWithOptions function, but I still get this error. I don't even have a navBar declared anywhere! I assume there's some kind of project or file setting outside of the code that is the problem?</p>
  
  <pre><code>2011-11-22 14:39:32.294 LetsEat[15320:b603] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[&lt;LetsEatAppDelegate 0x5a824a0&gt; setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key navBar.'
  *** Call stack at first throw:
  (
      0   CoreFoundation                      0x00fa45a9 __exceptionPreprocess + 185
      1   libobjc.A.dylib                     0x010f8313 objc_exception_throw + 44
      2   CoreFoundation                      0x00fa44e1 -[NSException raise] + 17
      3   Foundation                          0x0079f677 _NSSetUsingKeyValueSetter + 135
      4   Foundation                          0x0079f5e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
      5   UIKit                               0x0021b30c -[UIRuntimeOutletConnection connect] + 112
      6   CoreFoundation                      0x00f1a8cf -[NSArray makeObjectsPerformSelector:] + 239
      7   UIKit                               0x00219d23 -[UINib instantiateWithOwner:options:] + 1041
      8   UIKit                               0x0021bab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
      9   UIKit                               0x0002117a -[UIApplication _loadMainNibFile] + 172
      10  UIKit                               0x00021cf4 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 291
      11  UIKit                               0x0002c617 -[UIApplication handleEvent:withNewEvent:] + 1533
      12  UIKit                               0x00024abf -[UIApplication sendEvent:] + 71
      13  UIKit                               0x00029f2e _UIApplicationHandleEvent + 7576
      14  GraphicsServices                    0x011dd992 PurpleEventCallback + 1550
      15  CoreFoundation                      0x00f85944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
      16  CoreFoundation                      0x00ee5cf7 __CFRunLoopDoSource1 + 215
      17  CoreFoundation                      0x00ee2f83 __CFRunLoopRun + 979
      18  CoreFoundation                      0x00ee2840 CFRunLoopRunSpecific + 208
      19  CoreFoundation                      0x00ee2761 CFRunLoopRunInMode + 97
      20  UIKit                               0x000217d2 -[UIApplication _run] + 623
      21  UIKit                               0x0002dc93 UIApplicationMain + 1160
      22  LetsEat                             0x00001c99 main + 121
      23  LetsEat                             0x00001c15 start + 53
  )
  terminate called throwing an exceptionCurrent language:  auto; currently objective-c
  (gdb)
  </code></pre>
  
  <p>EDIT: This is the top of my delegate.m file. As you can see it's all boilerplate:</p>
  
  <pre><code>#import "LetsEatAppDelegate.h"
  //#import "ItemsViewController.h"
  
  @implementation LetsEatAppDelegate
  
  @synthesize window = _window;
  @synthesize managedObjectContext = __managedObjectContext;
  @synthesize managedObjectModel = __managedObjectModel;
  @synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
  
  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  {
      // Override point for customization after application launch.
      [self.window makeKeyAndVisible];
      return YES;
  } 
  </code></pre>
  
  <p>I removed every other file in the project and still get this error. </p>
  
  <p><strong>EDIT 2</strong></p>
  
  <p>As it now stands, I only get this error on my work machine. The exact same files run perfectly on my home laptop. Same version of XCode (4.2.1)</p>