Thread 1: signal SIGABRT

I often got this Thread 1: signal SIGABRT error when i execute code. here is my code :

import UIKit

class ViewController: UIViewController {

//all the conections


//@IBOutlet weak var errorOutput: UILabel!
@IBOutlet weak var errorOutput: UILabel!
@IBOutlet weak var result: UILabel!
@IBOutlet weak var instructions: UILabel!
@IBOutlet weak var year: UITextField!

//other stuff var watis = false

//the errors
enum error: Error {
    case noInput(description: String)
    case ThecnicalDifficulties(description: String)
}
override func viewDidLoad() {
    super.viewDidLoad()



}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func GoButton(_ sender: Any) {
Cauculator()
}
//Int(input1.text!)!
func Cauculator () {

func animalResults () -> String {

    if Int(year.text!)! % 12 == 0 {
        return "Monkey"
    } else if Int(year.text!)! % 12 == 1 {
        return "Rooster"

    }else if Int(year.text!)! % 12 == 2 {
        return "Dog"
    } else if Int(year.text!)! % 12 == 3 {
        return "Pig"
    }else if Int(year.text!)! % 12 == 4 {
        return "Rat"
    }else if Int(year.text!)! % 12 == 5 {
        return "Ox"
    }else if Int(year.text!)! % 12 == 6 {
        return "Tiger"
    }else if Int(year.text!)! % 12 == 7 {
        return "Rabbit"
    }else if Int(year.text!)! % 12 == 8 {
        return "Dragon"
    }else if Int(year.text!)! % 12 == 9 {
        return "Snake"
    }else if Int(year.text!)! % 12 == 10 {
        return "Horse"
    }else {return "Sheep"}

}

self.result.text = animalResults()
}

}

and here is the council

018-01-27 12:50:57.026515-0800 chinese dragon[1939:41711] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<chinese_dragon.ViewController 0x7f965af0a8d0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key results.' *** First throw call stack: ( 0 CoreFoundation 0x000000011224a12b exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010e53ff41 objc_exception_throw + 48 2 CoreFoundation 0x000000011224a079 -[NSException raise] + 9 3 Foundation 0x000000010df5ea63 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292 4 UIKit 0x000000010ef7c117 -[UIViewController setValue:forKey:] + 87 5 UIKit 0x000000010f26dc2d -[UIRuntimeOutletConnection connect] + 109 6 CoreFoundation 0x00000001121ed3cd -[NSArray makeObjectsPerformSelector:] + 317 7 UIKit 0x000000010f26c5e3 -[UINib instantiateWithOwner:options:] + 1856 8 UIKit 0x000000010ef833ff -[UIViewController _loadViewFromNibNamed:bundle:] + 383 9 UIKit 0x000000010ef83d2b -[UIViewController loadView] + 177 10 UIKit 0x000000010ef8405c -[UIViewController loadViewIfRequired] + 195 11 UIKit 0x000000010ef848b9 -[UIViewController view] + 27 12 UIKit 0x000000010ee4f7cf -[UIWindow addRootViewControllerViewIfPossible] + 122 13 UIKit 0x000000010ee4fed7 -[UIWindow _setHidden:forced:] + 294 14 UIKit 0x000000010ee62e54 -[UIWindow makeKeyAndVisible] + 42 15 UIKit 0x000000010edd58b8 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4737 16 UIKit 0x000000010eddaaeb -[UIApplication _runWithMainScene:transitionContext:completion:] + 1720 17 UIKit 0x000000010f1a46f8 __111-[UICanvasLifecycleMonitor_Compatability scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 924 18 UIKit 0x000000010f57a4c8 +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153 19 UIKit 0x000000010f1a42f1 -[UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 249 20 UIKit 0x000000010f1a4b6b -[UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 696 21 UIKit 0x000000010fb22a69 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 262 22 UIKit 0x000000010fb22922 -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 444 23 UIKit 0x000000010f7ff9c8 __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 221 24 UIKit 0x000000010f9feb06 _performActionsWithDelayForTransitionContext + 100 25 UIKit 0x000000010f7ff88b -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 231 26 UIKit 0x000000010f579b25 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392 27 UIKit 0x000000010edd936a -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 523 28 UIKit 0x000000010f3b4605 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 369 29 FrontBoardServices 0x0000000114101cc0 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 338 30 FrontBoardServices 0x000000011410a7b5 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 235 31 libdispatch.dylib 0x000000011336533d _dispatch_client_callout + 8 32 libdispatch.dylib 0x000000011336a9f3 _dispatch_block_invoke_direct + 592 33 FrontBoardServices 0x0000000114136498 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK_ + 24 34 FrontBoardServices 0x000000011413614e -[FBSSerialQueue performNext] + 464 35 FrontBoardServices 0x00000001141366bd -[FBSSerialQueue _performNextFromRunLoopSource] + 45 36 CoreFoundation 0x00000001121ed101 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION_ + 17 37 CoreFoundation 0x000000011228cf71 __CFRunLoopDoSource0 + 81 38 CoreFoundation 0x00000001121d1a19 __CFRunLoopDoSources0 + 185 39 CoreFoundation 0x00000001121d0fff __CFRunLoopRun + 1279 40 CoreFoundation 0x00000001121d0889 CFRunLoopRunSpecific + 409 41 GraphicsServices 0x00000001149ca9c6 GSEventRunModal + 62 42 UIKit 0x000000010eddc5d6 UIApplicationMain + 159 43 chinese dragon 0x000000010dc277f7 main + 55 44 libdyld.dylib 0x00000001133e1d81 start + 1 45 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

please help