Ios – Swift: Terminating with uncaught exception of type NSException

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.

It says that:

Terminating app due to uncaught exception 'NSUnknownKeyException',
reason: '[
setValue:forUndefinedKey:]: this class is not key value
coding-compliant for the key CreditCardTextField.'

Here's the error in more detail:

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] * Terminating app
due to uncaught exception 'NSUnknownKeyException', reason:
'[ setValue:forUndefinedKey:]: this
class is not key value coding-compliant for the key
CreditCardTextField.'
* First throw call stack: ( 0 CoreFoundation 0x00000001106ccf35 exceptionPreprocess + 165 1 libobjc.A.dylib
0x000000011233ebb7 objc_exception_throw + 45 2 CoreFoundation
0x00000001106ccb79 -[NSException raise] + 9 3 Foundation
0x0000000110b6b7b3 -[NSObject(NSKeyValueCoding) setValue:forKey:] +
259 4 CoreFoundation 0x0000000110616e80
-[NSArray makeObjectsPerformSelector:] + 224 5 UIKit 0x000000011134bc7d -[UINib instantiateWithOwner:options:] + 1506 6
UIKit 0x00000001111aaf98
-[UIViewController _loadViewFromNibNamed:bundle:] + 242 7 UIKit 0x00000001111ab588 -[UIViewController loadView] + 109 8 UIKit
0x00000001111ab7f9 -[UIViewController loadViewIfRequired] + 75 9
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
0x000000011109a9b1 -[UIApplication sendEvent:] + 246 21 UIKit
0x00000001110a7a7d _UIApplicationHandleEventFromQueueEvent + 17370 22
UIKit 0x0000000111083103
_UIApplicationHandleEventQueue + 1961 23 CoreFoundation 0x0000000110602551
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 24 CoreFoundation 0x00000001105f841d
__CFRunLoopDoSources0 + 269 25 CoreFoundation 0x00000001105f7a54 __CFRunLoopRun + 868 26 CoreFoundation
0x00000001105f7486 CFRunLoopRunSpecific + 470 27 GraphicsServices
0x0000000113de79f0 GSEventRunModal + 161 28 UIKit
0x0000000111086420 UIApplicationMain + 1282 29 ParseStarterProject
0x000000010fbbe9de top_level_code + 78 30 ParseStarterProject
0x000000010fbbeaba main + 42 31 libdyld.dylib
0x0000000112b54145 start + 1 32 ???
0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with
uncaught exception of type NSException (lldb)