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Hello,I'm having an issue with my single view app. The build is succeeded but the excution fails. Here is the main code -- ViewController.swift --:// // ViewController.swift // Décodeur // // Created by Boustani on 9/23/19. // Copyright © 2019 Stif. All rights reserved. // import UIKit class ViewController: UIViewController { @IBOutlet weak var champMessageCodé: UITextField! @IBOutlet weak var libelléMessageDécodé: UILabel! override func viewDidLoad() { super.viewDidLoad() mettreÀJourMessageDécodé() champMessageCodé.becomeFirstResponder() } @IBAction func champTexteAChangé(_ sender: Any) { mettreÀJourMessageDécodé() } private static func décoder(message messageCodé: String) -> String { return String(messageCodé.reversed()) } func mettreÀJourMessageDécodé() { let texteEntré = champMessageCodé.text ?? "" let messageDécodé = ViewController.décoder(message:texteEntré) libelléMessageDécodé.text = messageDécodé } }And here is my stacktrace:2019-09-29 22:05:36.999631+0100 Décodeur[32109:3024886] Unknown class _TtC9Décodeur14ViewController in Interface Builder file.2019-09-29 22:05:37.214381+0100 Décodeur[32109:3024886] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x7ff368f07be0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key champMessageCodé.'*** First throw call stack:( 0 CoreFoundation 0x00000001093bf8db __exceptionPreprocess + 331 1 libobjc.A.dylib 0x00000001079d6ac5 objc_exception_throw + 48 2 CoreFoundation 0x00000001093bf449 -[NSException raise] + 9 3 Foundation 0x000000010744b3a6 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 289 4 UIKitCore 0x000000010bb11f8e -[UIViewController setValue:forKey:] + 87 5 UIKitCore 0x000000010bd9fcd9 -[UIRuntimeOutletConnection connect] + 109 6 CoreFoundation 0x00000001093abf21 -[NSArray makeObjectsPerformSelector:] + 305 7 UIKitCore 0x000000010bd9ca1f -[UINib instantiateWithOwner:options:] + 1810 8 UIKitCore 0x000000010bb1906b -[UIViewController _loadViewFromNibNamed:bundle:] + 382 9 UIKitCore 0x000000010bb199f5 -[UIViewController loadView] + 177 10 UIKitCore 0x000000010bb19d04 -[UIViewController loadViewIfRequired] + 172 11 UIKitCore 0x000000010bb1a524 -[UIViewController view] + 27 12 UIKitCore 0x000000010c15322b -[UIWindow addRootViewControllerViewIfPossible] + 122 13 UIKitCore 0x000000010c15391f -[UIWindow _setHidden:forced:] + 289 14 UIKitCore 0x000000010c16657e -[UIWindow makeKeyAndVisible] + 42 15 UIKitCore 0x000000010c11633c -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4555 16 UIKitCore 0x000000010c11b4e6 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1617 17 UIKitCore 0x000000010b95fa4e __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 904 18 UIKitCore 0x000000010b968346 +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153 19 UIKitCore 0x000000010b95f664 -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 236 20 UIKitCore 0x000000010b95ffc0 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1091 21 UIKitCore 0x000000010b95e332 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 782 22 UIKitCore 0x000000010b95dfe9 -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 433 23 UIKitCore 0x000000010b962d2e __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 576 24 UIKitCore 0x000000010b963988 _performActionsWithDelayForTransitionContext + 100 25 UIKitCore 0x000000010b962a95 -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 223 26 UIKitCore 0x000000010b967a48 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392 27 UIKitCore 0x000000010c119dc8 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 514 28 UIKitCore 0x000000010bcd102f -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 361 29 FrontBoardServices 0x00000001145fcd25 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 448 30 FrontBoardServices 0x0000000114606ad6 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 283 31 FrontBoardServices 0x0000000114606300 __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 53 32 libdispatch.dylib 0x000000010a757db5 _dispatch_client_callout + 8 33 libdispatch.dylib 0x000000010a75b2ba _dispatch_block_invoke_direct + 300 34 FrontBoardServices 0x00000001146380da __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30 35 FrontBoardServices 0x0000000114637d92 -[FBSSerialQueue _performNext] + 451 36 FrontBoardServices 0x0000000114638327 -[FBSSerialQueue _performNextFromRunLoopSource] + 42 37 CoreFoundation 0x0000000109326db1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 38 CoreFoundation 0x0000000109326633 __CFRunLoopDoSources0 + 243 39 CoreFoundation 0x0000000109320cef __CFRunLoopRun + 1231 40 CoreFoundation 0x00000001093204d2 CFRunLoopRunSpecific + 626 41 GraphicsServices 0x00000001115582fe GSEventRunModal + 65 42 UIKitCore 0x000000010c11cfc2 UIApplicationMain + 140 43 DeÃÅcodeur 0x00000001070f58eb main + 75 44 libdyld.dylib 0x000000010a7cc541 start + 1 45 ??? 0x0000000000000001 0x0 + 1)libc++abi.dylib: terminating with uncaught exception of type NSException(lldb)