title: iOS this class is not key value coding-compliant for the key label
body: <p>So I'm new to iOS programming and I've run into a problem. </p>
  
  <p>I created a new view controller, and clicked the checkmark to auto make a .xib file for it. In the xib file I put a label, that I want to fade in. So I tried linking it to my custom view controller, and keep crashing with 'this class is not key value coding-compliant for the key login1'. Login1 being the name of the UILabel I imported. Here's the header file for RootView:</p>
  
  <pre><code>@interface RootViewController : UIViewController {
      PlayerStatViewController *playerStatViewController;
      NSString *viewName;
  }
  @property (weak, nonatomic) IBOutlet UILabel *login1;
  @property (nonatomic, retain) PlayerStatViewController *playerStatViewController;
  @property (nonatomic, retain) NSString *viewName;
  
  -(IBAction)switchPage:(id)sender:(NSString *)toSwitch;
  -(void) animateButton;
  @end
  </code></pre>
  
  <p>And the .m file:
      #import "RootViewController.h"
      #import "FileUtils.h"</p>
  
  <pre><code>@interface RootViewController ()
  
  @end
  
  @implementation RootViewController
  
  @synthesize playerStatViewController;
  @synthesize viewName;
  @synthesize login1;
  
  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
  {
      self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
      if (self) {
      }
      self.viewName = @"Boot";
      return self;
  }
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
      NSString* fpath = [NSString stringWithFormat:@"%@%@", getDefPath(), @"/config.txt"];
      self.login1.text = loadfile(@"serverName", fpath);
  }
  
  - (void)didReceiveMemoryWarning
  {
      [super didReceiveMemoryWarning];
  }
  
  -(IBAction)switchPage:(id)sender :(NSString *)toSwitch {
      if([toSwitch isEqualToString:(@"PlayerStat")]) {
          if(self.playerStatViewController == nil) {
          PlayerStatViewController *playerStatView = [[PlayerStatViewController alloc]
                                                      initWithNibName:(@"PlayerStat") bundle:[NSBundle mainBundle]];
              self.playerStatViewController = playerStatView;
          }
      [self.navigationController pushViewController:self.playerStatViewController animated:YES];
      }else if([toSwitch isEqualToString:(@"Boot")]) {
          [self.navigationController pushViewController:self animated:YES];
      }
  }
  
  - (void)viewDidAppear:(BOOL)animated {
      [super viewDidAppear:animated];
      [self performSelector:@selector(animateButton) withObject:nil afterDelay:0.1f];
  }
  
  - (void)animateButton {
      self.login1.alpha = 0;
  
      [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseIn
                       animations:^{ self.login1.alpha = 1;}
                        completion:nil];
  }
  
  @end
  </code></pre>
  
  <p>How I load the Xib (if it matters):</p>
  
  <pre><code> - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
      {
          self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
          RootViewController *viewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
          [self.window setRootViewController:viewController];
          [window makeKeyAndVisible];
          return YES;
      }
  </code></pre>
  
  <p>Project being built for iPhone only.
  In the Xib, yes the custom view controller is set as the file owner. There is no mispointing values (exclamation points in inspection manager).</p>
  
  <p>edit:
  crash log:</p>
  
  <pre><code>    2014-08-06 06:02:12.887 TrinityApi[5761:60b] *** Terminating app due to uncaught exception     'NSUnknownKeyException', reason: '[&lt;UIApplication 0x8c781d0&gt; setValue:forUndefinedKey:]: this     class is not key value coding-compliant for the key login1.'
  *** First throw call stack:
  (
      0   CoreFoundation                      0x017ee1e4 __exceptionPreprocess + 180
      1   libobjc.A.dylib                     0x0156d8e5 objc_exception_throw + 44
      2   CoreFoundation                      0x0187dfe1 -[NSException raise] + 17
      3   Foundation                          0x0122dd9e -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
      4   Foundation                          0x0119a1d7 _NSSetUsingKeyValueSetter + 88
      5   Foundation                          0x01199731 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
      6   Foundation                          0x011fbb0a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
      7   UIKit                               0x004e41f4 -[UIRuntimeOutletConnection connect] + 106
      8   libobjc.A.dylib                     0x0157f7de -[NSObject performSelector:] + 62
      9   CoreFoundation                      0x017e976a -[NSArray makeObjectsPerformSelector:] + 314
      10  UIKit                               0x004e2d4d -[UINib instantiateWithOwner:options:] + 1417
      11  UIKit                               0x004e4ada -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 165
      12  UIKit                               0x0022d61b -[UIApplication _loadMainNibFileNamed:bundle:] + 58
      13  UIKit                               0x0022d949 -[UIApplication _loadMainInterfaceFile] + 245
      14  UIKit                               0x0022c54e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 543
      15  UIKit                               0x00240f92 -[UIApplication handleEvent:withNewEvent:] + 3517
      16  UIKit                               0x00241555 -[UIApplication sendEvent:] + 85
      17  UIKit                               0x0022e250 _UIApplicationHandleEvent + 683
      18  GraphicsServices                    0x037e3f02 _PurpleEventCallback + 776
      19  GraphicsServices                    0x037e3a0d PurpleEventCallback + 46
      20  CoreFoundation                      0x01769ca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
      21  CoreFoundation                      0x017699db __CFRunLoopDoSource1 + 523
      22  CoreFoundation                      0x0179468c __CFRunLoopRun + 2156
      23  CoreFoundation                      0x017939d3 CFRunLoopRunSpecific + 467
      24  CoreFoundation                      0x017937eb CFRunLoopRunInMode + 123
      25  UIKit                               0x0022bd9c -[UIApplication _run] + 840
      26  UIKit                               0x0022df9b UIApplicationMain + 1225
      27  TrinityApi                          0x00002a9d main + 141
      28  libdyld.dylib                       0x01e35701 start + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  </code></pre>
  
  <p>EDIT: Just randomly started to work</p>