NSUnknownKeyException Causing Crash on Button Click [duplicate] - iphone

Question

This question already has answers here:
Xcode - How to fix 'NSUnknownKeyException', reason: … this class is not key value coding-compliant for the key X" error?
(79 answers)
Closed 7 years ago.
So I'm not sure what is going on. I haven't really changed much. Nothing having to do with this class anyways. It was working fine just a bit before and now I'm getting this crash.
-(IBAction)mphButton:(id)sender{
if(self.mphVC == nil){
MphViewController *mph = [[MphViewController alloc] initWithNibName:#"MphView" bundle:[NSBundle mainBundle]];
self.mphVC = mph;
[mph release];
}
[self.navigationController pushViewController:self.mphVC animated:YES];
}
The thread is stopping saying "Thread 1: Program received signal "SIGABRT" on the [self.navigationController pushViewController:self.mphVC animated:YES];
This is what the message:
2011-09-29 10:59:03.557 SpeedClock[2973:b303] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<MphViewController 0x4b42ad0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key count.'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dc25a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f16313 objc_exception_throw + 44
2 CoreFoundation 0x00dc24e1 -[NSException raise] + 17
3 Foundation 0x00794677 _NSSetUsingKeyValueSetter + 135
4 Foundation 0x007945e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
5 UIKit 0x0021030c -[UIRuntimeOutletConnection connect] + 112
6 CoreFoundation 0x00d388cf -[NSArray makeObjectsPerformSelector:] + 239
7 UIKit 0x0020ed23 -[UINib instantiateWithOwner:options:] + 1041
8 UIKit 0x00210ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
9 UIKit 0x000c6628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
10 UIKit 0x000c4134 -[UIViewController loadView] + 120
11 UIKit 0x000c400e -[UIViewController view] + 56
12 UIKit 0x000c2482 -[UIViewController contentScrollView] + 42
13 UIKit 0x000d2f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
14 UIKit 0x000d1555 -[UINavigationController _layoutViewController:] + 43
15 UIKit 0x000d2870 -[UINavigationController _startTransition:fromViewController:toViewController:] + 524
16 UIKit 0x000cd32a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
17 UIKit 0x000d4562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932
18 UIKit 0x000cd1c4 -[UINavigationController pushViewController:animated:] + 62
19 SpeedClock 0x00002621 -[RootViewController mphButton:] + 353
20 UIKit 0x000144fd -[UIApplication sendAction:to:from:forEvent:] + 119
21 UIKit 0x000a4799 -[UIControl sendAction:to:forEvent:] + 67
22 UIKit 0x000a6c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
23 UIKit 0x000a57d8 -[UIControl touchesEnded:withEvent:] + 458
24 UIKit 0x00038ded -[UIWindow _sendTouchesForEvent:] + 567
25 UIKit 0x00019c37 -[UIApplication sendEvent:] + 447
26 UIKit 0x0001ef2e _UIApplicationHandleEvent + 7576
27 GraphicsServices 0x00ffb992 PurpleEventCallback + 1550
28 CoreFoundation 0x00da3944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
29 CoreFoundation 0x00d03cf7 __CFRunLoopDoSource1 + 215
30 CoreFoundation 0x00d00f83 __CFRunLoopRun + 979
31 CoreFoundation 0x00d00840 CFRunLoopRunSpecific + 208
32 CoreFoundation 0x00d00761 CFRunLoopRunInMode + 97
33 GraphicsServices 0x00ffa1c4 GSEventRunModal + 217
34 GraphicsServices 0x00ffa289 GSEventRun + 115
35 UIKit 0x00022c93 UIApplicationMain + 1160
36 SpeedClock 0x00001f59 main + 121
37 SpeedClock 0x00001ed5 start + 53
38 ??? 0x00000001 0x0 + 1
)
terminate called throwing an exceptionCurrent language: auto; currently objective-c
(gdb)
I can read these pretty well on Logcat on android. Just not use to reading this one. I saw another post saying that their class might not have been connected to their view. Mine is. It was working just fine prior to me putting in some stuff (which I recommented out and it still isnt working) on the MPHViewController.m
Any and all help is appreciated... Thanks :)

Answer 1

You most likely have something in your "MphView" XIB file called "count" that you no longer have in MphViewController. Maybe a delegate set for an object that's no longer there, or an action, or something like that. Check all your connections in Interface Builder and remove any broken ones.