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I am newbie for iOS Please help ,When I run the code for the first time, it runs successfully in emulator along with the correct output. Now for the same code it show the following error:

2015-10-09 11:25:30.569 ViewController[1417:44846] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key outlinebtn.' * First throw call stack:

( 0 CoreFoundation 0x000000010c840f35 exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000010c130bb7 objc_exception_throw + 45 2 CoreFoundation
0x000000010c840b79 -[NSException raise] + 9 3 Foundation
0x000000010bccd7b3 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259 4 CoreFoundation 0x000000010c78ae80 -[NSArray makeObjectsPerformSelector:] + 224 5 UIKit 0x000000010cef2c7d -[UINib instantiateWithOwner:options:] + 1506 6
UIKit 0x000000010cd51f98 -[UIViewController _loadViewFromNibNamed:bundle:] + 242 7 UIKit 0x000000010cd52588 -[UIViewController loadView] + 109 8 UIKit
0x000000010cd527f9 -[UIViewController loadViewIfRequired] + 75 9
UIKit 0x000000010cd52c8e -[UIViewController view] + 27 10 UIKit 0x000000010cc71ca9 -[UIWindow addRootViewControllerViewIfPossible] + 58 11 UIKit 0x000000010cc72041 -[UIWindow _setHidden:forced:] + 247 12 UIKit 0x000000010cc7e72c -[UIWindow makeKeyAndVisible] + 42 13 UIKit
0x000000010cc29061 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2628 14 UIKit 0x000000010cc2bd2c -[UIApplication _runWithMainScene:transitionContext:completion:] + 1350 15 UIKit 0x000000010cc2abf2 -[UIApplication workspaceDidEndTransaction:] + 179 16 FrontBoardServices 0x000000010f3e92a3 __31-[FBSSerialQueue performAsync:]_block_invoke + 16 17 CoreFoundation 0x000000010c77653c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12 18 CoreFoundation 0x000000010c76c285 __CFRunLoopDoBlocks + 341 19 CoreFoundation
0x000000010c76ba43 __CFRunLoopRun + 851 20 CoreFoundation
0x000000010c76b486 CFRunLoopRunSpecific + 470 21 UIKit
0x000000010cc2a669 -[UIApplication _run] + 413 22 UIKit
0x000000010cc2d420 UIApplicationMain + 1282 23 ViewController
0x000000010bc01e43 main + 115 24 libdyld.dylib
0x000000010edd0145 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

What to do ??/ please help me. I am new for iOS

Joyal Clifford
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  • Place a break-point and identify the line of crash.... and include that in the question. – Rumin Oct 09 '15 at 06:15
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    Possible duplicate of [What does this mean? "'NSUnknownKeyException', reason:This class is not key value coding-compliant for the key X"](http://stackoverflow.com/questions/3088059/what-does-this-mean-nsunknownkeyexception-reasonthis-class-is-not-key-valu) – Peter O. Apr 09 '16 at 13:52

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