간단한 스위프트 스테퍼 오류

저는 스위프트를 처음 사용하고 스테퍼와 같은 것들을 실험하고 있습니다. 나는 온라인 단계별 지침을 따라 방법을 만드는 방법을 따라 갔지만 오류가 발생했습니다 (아래 첨부).간단한 스위프트 스테퍼 오류

오류 :

2016-06-04 04:31:15.832 numChsnger[12025:1111078] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<numChsnger.ViewController 0x7fc082695990> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key stepper.' 
*** First throw call stack: 
(
0 CoreFoundation      0x0000000102328d85 __exceptionPreprocess + 165 
1 libobjc.A.dylib      0x00000001040ccdeb objc_exception_throw + 48 
2 CoreFoundation      0x00000001023289c9 -[NSException raise] + 9 
3 Foundation       0x00000001026fa19b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 288 
4 UIKit        0x0000000102ce3d0c -[UIViewController setValue:forKey:] + 88 
5 UIKit        0x0000000102f1a7fb -[UIRuntimeOutletConnection connect] + 109 
6 CoreFoundation      0x0000000102262890 -[NSArray makeObjectsPerformSelector:] + 224 
7 UIKit        0x0000000102f191de -[UINib instantiateWithOwner:options:] + 1864 
8 UIKit        0x0000000102cea8d6 -[UIViewController _loadViewFromNibNamed:bundle:] + 381 
9 UIKit        0x0000000102ceb202 -[UIViewController loadView] + 178 
10 UIKit        0x0000000102ceb560 -[UIViewController loadViewIfRequired] + 138 
11 UIKit        0x0000000102cebcd3 -[UIViewController view] + 27 
12 UIKit        0x0000000102bc1fb4 -[UIWindow addRootViewControllerViewIfPossible] + 61 
13 UIKit        0x0000000102bc269d -[UIWindow _setHidden:forced:] + 282 
14 UIKit        0x0000000102bd4180 -[UIWindow makeKeyAndVisible] + 42 
15 UIKit        0x0000000102b48ed9 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4131 
16 UIKit        0x0000000102b4f568 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1769 
17 UIKit        0x0000000102b4c714 -[UIApplication workspaceDidEndTransaction:] + 188 
18 FrontBoardServices     0x0000000105f5d8c8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24 
19 FrontBoardServices     0x0000000105f5d741 -[FBSSerialQueue _performNext] + 178 
20 FrontBoardServices     0x0000000105f5daca -[FBSSerialQueue _performNextFromRunLoopSource] + 45 
21 CoreFoundation      0x000000010224e301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 
22 CoreFoundation      0x000000010224422c __CFRunLoopDoSources0 + 556 
23 CoreFoundation      0x00000001022436e3 __CFRunLoopRun + 867 
24 CoreFoundation      0x00000001022430f8 CFRunLoopRunSpecific + 488 
25 UIKit        0x0000000102b4bf21 -[UIApplication _run] + 402 
26 UIKit        0x0000000102b50f09 UIApplicationMain + 171 
27 numChsnger       0x0000000102144382 main + 114 
28 libdyld.dylib      0x0000000104b9092d start + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException

보기 : 당신의 스테퍼는 스토리 보드에서 중복 콘센트가있는 경우