This class is not key value coding-compliant

Question

When I try to run my application on the iPhone simulator, It crashes and I get this error:

2013-10-22 20:24:02.367 brainademy[46328:a0b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIApplication 0xcc6de90> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key ChooseGameViewController.'
*** First throw call stack:
(
0   CoreFoundation                      0x01a0d5e4 __exceptionPreprocess + 180
1   libobjc.A.dylib                     0x017908b6 objc_exception_throw + 44
2   CoreFoundation                      0x01a9d6a1 -[NSException raise] + 17
3   Foundation                          0x01451c2e -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4   Foundation                          0x013bdf3b _NSSetUsingKeyValueSetter + 88
5   Foundation                          0x013bd493 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
6   Foundation                          0x0141f94a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
7   UIKit                               0x007a4cd5 -[UIRuntimeOutletConnection connect] + 106
8   libobjc.A.dylib                     0x017a27d2 -[NSObject performSelector:] + 62
9   CoreFoundation                      0x01a08b6a -[NSArray makeObjectsPerformSelector:] + 314
10  UIKit                               0x007a382e -[UINib instantiateWithOwner:options:] + 1417
11  UIKit                               0x007a55bb -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 165
12  UIKit                               0x00502fcb -[UIApplication _loadMainNibFileNamed:bundle:] + 58
13  UIKit                               0x005032f9 -[UIApplication _loadMainInterfaceFile] + 245
14  UIKit                               0x00501e9f -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 543
15  UIKit                               0x0051642c -[UIApplication handleEvent:withNewEvent:] + 3447
16  UIKit                               0x00516999 -[UIApplication sendEvent:] + 85
17  UIKit                               0x00503c35 _UIApplicationHandleEvent + 736
18  GraphicsServices                    0x0319e2eb _PurpleEventCallback + 776
19  GraphicsServices                    0x0319ddf6 PurpleEventCallback + 46
20  CoreFoundation                      0x01988dd5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
21  CoreFoundation                      0x01988b0b __CFRunLoopDoSource1 + 523
22  CoreFoundation                      0x019b37ec __CFRunLoopRun + 2156
23  CoreFoundation                      0x019b2b33 CFRunLoopRunSpecific + 467
24  CoreFoundation                      0x019b294b CFRunLoopRunInMode + 123
25  UIKit                               0x005016ed -[UIApplication _run] + 840
26  UIKit                               0x0050394b UIApplicationMain + 1225
27  brainademy                          0x0000b01d main + 141
28  libdyld.dylib                       0x02e8c725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Most of the time, this is going to mean that I have something in my File's owner, an IBOutlet or IBAction that is not declared, yet this is not the case. I have looked at every single other question like this and none of them have helped.

ChooseGameViewController IS declared, so that shouldn't cause any problems, but I tried unhooking it from the File's owner, and when I do, and run my app, It crashes and instead of ChooseGameViewController it's ColorGameViewController. I tried removing every single one of my ViewController IBOutlets, and when I did that, I got other IBOutlets, like labels and buttons, that showed up in the error instead of ChooseGameViewController. I get no errors next to any of my outlets, like you usually would if you had an non-declared outlet.

I tried making a clean build, but that didn't work, and my File's owner is hooked up to the correct class (RootViewController)

This app was working fine just a while ago, and I just opened up Xcode today and I started getting these errors.

This is not a problem with non-declared outlets, because:

• All the outlets ARE declared
• I get no errors in the file's owner
• This error happens with every single IBOutlet, and IBOutlets only

What is the cause of this error?

Answer 1

I fixed it by creating a new Xcode project and copying everything over, which makes me think it had something to do with the me trying to add support for iPad.

This happens whenever I try to do this, even making a new application, making it universal, and making the new .xib file for iPad, and hooking it up via the project manager.

Even when I remove support for iPad the error above still shows, I think I have to do something with just changing the view controller using code.

Answer 2

It shouldn't look ChooseGameViewController on UIApplication.

I guess your AppDelegate have a property ChooseGameViewController so you need to go to interface builder and make sure your outlets hook to AppDelegate not UIApplication

If you have source control, make a diff and see what's changed. Otherwise you can open .xib file using XML editor and check it does not contain UIApplication in unexpected place.

Answer 3

I got the same issue when I deleted one IBOutlet property from a class. I see storyboard still keep the IBOutlet link even when deleting the IBOutlet property.

Solution

1. Find in your class if you deleted any Outlet property
2. Navigate to the storyboard find the object and Outlet link and remove

Hope this work for you.