title: Swift: Terminating with uncaught exception of type NSException
body: <p>I'm developing a simple app and when I click to sign up the user, the app gets terminated. Please help me figure this out.</p>
  
  <p>It says that: </p>
  
  <blockquote>
    <p>Terminating app due to uncaught exception 'NSUnknownKeyException',
    reason: '[
    setValue:forUndefinedKey:]: this class is not key value
    coding-compliant for the key CreditCardTextField.'</p>
  </blockquote>
  
  <p>Here's the error in more detail:</p>
  
  <blockquote>
    <p>015-06-04 22:42:57.661 ParseStarterProject[43853:4461316] Unknown
    class RegisterPageViewController in Interface Builder file. 2015-06-04
    22:42:57.712 ParseStarterProject[43853:4461316] <strong>* Terminating app
    due to uncaught exception 'NSUnknownKeyException', reason:
    '[ setValue:forUndefinedKey:]: this
    class is not key value coding-compliant for the key
    CreditCardTextField.'
    *</strong> First throw call stack: (     0   CoreFoundation                      0x00000001106ccf35 <strong>exceptionPreprocess + 165  1   libobjc.A.dylib<br>
    0x000000011233ebb7 objc_exception_throw + 45  2   CoreFoundation<br>
    0x00000001106ccb79 -[NSException raise] + 9   3   Foundation<br>
    0x0000000110b6b7b3 -[NSObject(NSKeyValueCoding) setValue:forKey:] +
    259   4   CoreFoundation                      0x0000000110616e80
    -[NSArray makeObjectsPerformSelector:] + 224  5   UIKit                               0x000000011134bc7d -[UINib instantiateWithOwner:options:] + 1506    6<br>
    UIKit                               0x00000001111aaf98
    -[UIViewController _loadViewFromNibNamed:bundle:] + 242   7   UIKit                               0x00000001111ab588 -[UIViewController loadView] + 109   8   UIKit<br>
    0x00000001111ab7f9 -[UIViewController loadViewIfRequired] + 75    9<br>
    UIKit                               0x00000001111abc8e
    -[UIViewController view] + 27     10  UIKit                               0x000000011174d41e -[_UIFullscreenPresentationController
    _setPresentedViewController:] + 65    11  UIKit                               0x0000000111187429 -[UIPresentationController
    initWithPresentedViewController:presentingViewController:] + 105  12 
    UIKit                               0x00000001111b7a41
    -[UIViewController _presentViewController:withAnimationController:completion:] + 1746     13  UIKit                               0x00000001111b9d81
    __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 132     14 
    UIKit                               0x00000001111b9ca5
    -[UIViewController presentViewController:animated:completion:] + 229  15  UIKit                               0x00000001110878be
    -[UIApplication sendAction:to:from:forEvent:] + 75    16  UIKit                               0x000000011118e410 -[UIControl _sendActionsForEvents:withEvent:] + 467
      17  UIKit                               0x000000011118d7df
    -[UIControl touchesEnded:withEvent:] + 522    18  UIKit                               0x00000001110cd308 -[UIWindow _sendTouchesForEvent:] + 735  19  UIKit 
    0x00000001110cdc33 -[UIWindow sendEvent:] + 683   20  UIKit<br>
    0x000000011109a9b1 -[UIApplication sendEvent:] + 246  21  UIKit<br>
    0x00000001110a7a7d _UIApplicationHandleEventFromQueueEvent + 17370    22
    UIKit                               0x0000000111083103
    _UIApplicationHandleEventQueue + 1961     23  CoreFoundation                      0x0000000110602551
    __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION</strong> + 17   24  CoreFoundation                      0x00000001105f841d
    __CFRunLoopDoSources0 + 269   25  CoreFoundation                      0x00000001105f7a54 __CFRunLoopRun + 868     26  CoreFoundation<br>
    0x00000001105f7486 CFRunLoopRunSpecific + 470     27  GraphicsServices<br>
    0x0000000113de79f0 GSEventRunModal + 161  28  UIKit<br>
    0x0000000111086420 UIApplicationMain + 1282   29  ParseStarterProject<br>
    0x000000010fbbe9de top_level_code + 78    30  ParseStarterProject<br>
    0x000000010fbbeaba main + 42  31  libdyld.dylib<br>
    0x0000000112b54145 start + 1  32  ???<br>
    0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with
    uncaught exception of type NSException (lldb)</p>
  </blockquote>