i am creating an app which contains lots of label and text value etc... on registration page
without localisation my app working perfect but after doing localization i got error
-[UILabel charValue]: unrecognized selector sent to instance 0x765b980
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILabel charValue]: unrecognized selector sent to instance 0x765b980'
* Call stack at first throw:
(
0 CoreFoundation 0x02aa7b99 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x02bf740e objc_exception_throw + 47
2 CoreFoundation 0x02aa96ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x02a192b6 ___forwarding___ + 966
4 CoreFoundation 0x02a18e72 _CF_forwarding_prep_0 + 50
5 Foundation 0x001ebc2c _NSSetCharValueForKeyInIvar + 68
6 Foundation 0x00157152 _NSSetUsingKeyValueSetter + 230
7 Foundation 0x00157061 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
8 UIKit 0x005d570a -[UIRuntimeOutletConnection connect] + 112
9 CoreFoundation 0x02a1dded -[NSArray makeObjectsPerformSelector:] + 461
10 UIKit 0x005d4121 -[UINib instantiateWithOwner:options:] + 1041
11 UIKit 0x005d5eb5 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
12 UIKit 0x0048b95f -[UIViewController _loadViewFromNibNamed:bundle:] + 70
13 UIKit 0x00489675 -[UIViewController loadView] + 120
14 UIKit 0x0048954f -[UIViewController view] + 56
15 UIKit 0x004879f4 -[UIViewController contentScrollView] + 42
16 UIKit 0x004977e2 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
17 UIKit 0x00495ea3 -[UINavigationController _layoutViewController:] + 43
18 UIKit 0x0049712d -[UINavigationController _startTransition:fromViewController:toViewController:] + 524
19 UIKit 0x00491ccd -[UINavigationController _startDeferredTransitionIfNeeded] + 266
20 UIKit 0x00498d8b -[UINavigationController pushViewController:transition:forceImmediate:] + 876
21 UIKit 0x00491b67 -[UINavigationController pushViewController:animated:] + 62
22 Buzzador 0x000039b8 -[BuzzadorViewController newuserBtnPressed] + 146
23 UIKit 0x003df7f8 -[UIApplication sendAction:to:from:forEvent:] + 119
24 UIKit 0x0046ade0 -[UIControl sendAction:to:forEvent:] + 67
25 UIKit 0x0046d262 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
26 UIKit 0x0046c053 -[UIControl touchesBegan:withEvent:] + 277
27 UIKit 0x00403324 -[UIWindow _sendTouchesForEvent:] + 395
28 UIKit 0x003e4cb4 -[UIApplication sendEvent:] + 447
29 UIKit 0x003e99bf _UIApplicationHandleEvent + 7672
30 GraphicsServices 0x030d0822 PurpleEventCallback + 1550
31 CoreFoundation 0x02a88ff4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
32 CoreFoundation 0x029e9807 __CFRunLoopDoSource1 + 215
33 CoreFoundation 0x029e6a93 __CFRunLoopRun + 979
34 CoreFoundation 0x029e6350 CFRunLoopRunSpecific + 208
35 CoreFoundation 0x029e6271 CFRunLoopRunInMode + 97
36 GraphicsServices 0x030cf00c GSEventRunModal + 217
37 GraphicsServices 0x030cf0d1 GSEventRun + 115
38 UIKit 0x003edaf2 UIApplicationMain + 1160
39 Buzzador 0x00002610 main + 102
40 Buzzador 0x000025a1 start + 53
)
terminate called after throwing an instance of 'NSException'
all other page work perfect with localization accept this registration.
please help me
Maybe you meant - [UILabel text] instead of - [UILabel charValue]?
i find the solution.. i removed all unused variables.. and it works fine...
thanx to all
Related
Could anyone help me understand why Im getting this error? It seems to be happening when I load one of my view controllers but I can't see why.
What usually causes an error like this?
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITextInputTraits length]: unrecognized selector sent to instance 0x7fbf924828a0'
*** First throw call stack:
(
0 CoreFoundation 0x000000010664ac65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000105f27bb7 objc_exception_throw + 45
2 CoreFoundation 0x00000001066520ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00000001065a813c ___forwarding___ + 988
4 CoreFoundation 0x00000001065a7cd8 _CF_forwarding_prep_0 + 120
5 libswiftCore.dylib 0x0000000107ddf728 _TTSf4g_d___TFSSCfMSSFT12_cocoaStringPSs9AnyObject__SS + 120
6 libswiftCore.dylib 0x0000000107dc01a3 _TFSSCfMSSFT12_cocoaStringPSs9AnyObject__SS + 19
7 Project1 0x00000001054ec3bd _TToFC8ASA_Rank22SettingsViewControllers9ASANumberSS + 61
8 Foundation 0x0000000105abdb53 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
9 CoreFoundation 0x0000000106592d50 -[NSArray makeObjectsPerformSelector:] + 224
10 UIKit 0x0000000106d1b4eb -[UINib instantiateWithOwner:options:] + 1506
11 UIKit 0x0000000106b736d8 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
12 UIKit 0x0000000106b73cc8 -[UIViewController loadView] + 109
13 UIKit 0x0000000106b73f39 -[UIViewController loadViewIfRequired] + 75
14 UIKit 0x0000000106b743ce -[UIViewController view] + 27
15 UIKit 0x000000010710132d -[_UIFullscreenPresentationController _setPresentedViewController:] + 65
16 UIKit 0x0000000106b4ed69 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 105
17 UIKit 0x0000000106b80248 -[UIViewController _presentViewController:withAnimationController:completion:] + 1761
18 UIKit 0x0000000106b826c1 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 132
19 UIKit 0x0000000106b825e5 -[UIViewController presentViewController:animated:completion:] + 229
20 UIKit 0x0000000106a44d62 -[UIApplication sendAction:to:from:forEvent:] + 75
21 UIKit 0x0000000106b5650a -[UIControl _sendActionsForEvents:withEvent:] + 467
22 UIKit 0x0000000106b558d9 -[UIControl touchesEnded:withEvent:] + 522
23 UIKit 0x0000000106a91958 -[UIWindow _sendTouchesForEvent:] + 735
24 UIKit 0x0000000106a92282 -[UIWindow sendEvent:] + 682
25 UIKit 0x0000000106a58541 -[UIApplication sendEvent:] + 246
26 UIKit 0x0000000106a65cdc _UIApplicationHandleEventFromQueueEvent + 18265
27 UIKit 0x0000000106a4059c _UIApplicationHandleEventQueue + 2066
28 CoreFoundation 0x000000010657e431 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
29 CoreFoundation 0x00000001065742fd __CFRunLoopDoSources0 + 269
30 CoreFoundation 0x0000000106573934 __CFRunLoopRun + 868
31 CoreFoundation 0x0000000106573366 CFRunLoopRunSpecific + 470
32 GraphicsServices 0x000000010a1e0a3e GSEventRunModal + 161
33 UIKit 0x0000000106a438c0 UIApplicationMain + 1282
34 Project1 0x00000001054f70c7 main + 135
35 libdyld.dylib 0x0000000108530145 start + 1
36 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Please ask for any other informations that is helpful
Thanks
You most likely have an Outlet assigned to an element on the view controller you are transitioning to that is no longer connected to your code. This youtube video explains it in more detail.
To hunt down this issue, try right-clicking on all your elements (UILabels, UIViews, UIButton...) with the assistant editor open and cross check to see if the outlet name is referenced in the view controller.
I have tried to do various things to fix this SIGABRT error, I know it's very common but I can't seem to figure it out. Here is my error:
2013-10-09 22:16:41.277 Tap![4895:a0b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<gameViewController 0x9944780> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key tapAction.'
*** First throw call stack:
(
0 CoreFoundation 0x017365e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014b98b6 objc_exception_throw + 44
2 CoreFoundation 0x017c66a1 -[NSException raise] + 17
3 Foundation 0x0117ac2e -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4 Foundation 0x010e6f3b _NSSetUsingKeyValueSetter + 88
5 Foundation 0x010e6493 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
6 Foundation 0x0114894a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
7 UIKit 0x004cdcd5 -[UIRuntimeOutletConnection connect] + 106
8 libobjc.A.dylib 0x014cb7d2 -[NSObject performSelector:] + 62
9 CoreFoundation 0x01731b6a -[NSArray makeObjectsPerformSelector:] + 314
10 UIKit 0x004cc82e -[UINib instantiateWithOwner:options:] + 1417
11 UIKit 0x0075f38f -[UIStoryboard instantiateViewControllerWithIdentifier:] + 220
12 UIKit 0x0075f988 -[UIStoryboardSegueTemplate _perform:] + 88
13 UIKit 0x0075fa59 -[UIStoryboardSegueTemplate perform:] + 115
14 libobjc.A.dylib 0x014cb874 -[NSObject performSelector:withObject:withObject:] + 77
15 UIKit 0x0022dc8c -[UIApplication sendAction:to:from:forEvent:] + 108
16 UIKit 0x0022dc18 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
17 UIKit 0x003256d9 -[UIControl sendAction:to:forEvent:] + 66
18 UIKit 0x00325a9c -[UIControl _sendActionsForEvents:withEvent:] + 577
19 UIKit 0x00324d4b -[UIControl touchesEnded:withEvent:] + 641
20 UIKit 0x0026b0cd -[UIWindow _sendTouchesForEvent:] + 852
21 UIKit 0x0026bd34 -[UIWindow sendEvent:] + 1232
22 UIKit 0x0023fa36 -[UIApplication sendEvent:] + 242
23 UIKit 0x00229d9f _UIApplicationHandleEventQueue + 11421
24 CoreFoundation 0x016bf8af __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
25 CoreFoundation 0x016bf23b __CFRunLoopDoSources0 + 235
26 CoreFoundation 0x016dc30e __CFRunLoopRun + 910
27 CoreFoundation 0x016dbb33 CFRunLoopRunSpecific + 467
28 CoreFoundation 0x016db94b CFRunLoopRunInMode + 123
29 GraphicsServices 0x036879d7 GSEventRunModal + 192
30 GraphicsServices 0x036877fe GSEventRun + 104
31 UIKit 0x0022c94b UIApplicationMain + 1225
32 Tap! 0x00003add main + 141
33 libdyld.dylib 0x01d72725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I have looked at the related classes and they do not have any problem. This problem occurs when I try to use a Segue.
This is the error i'm getting when i try and show a view controller modally inside my app:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<KVPasscodeViewController 0x8b815a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key instructionLabel.'
*** Call stack at first throw:
(
0 CoreFoundation 0x011185a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0126c313 objc_exception_throw + 44
2 CoreFoundation 0x011184e1 -[NSException raise] + 17
3 Foundation 0x00aea677 _NSSetUsingKeyValueSetter + 135
4 Foundation 0x00aea5e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
5 UIKit 0x0056630c -[UIRuntimeOutletConnection connect] + 112
6 CoreFoundation 0x0108e8cf -[NSArray makeObjectsPerformSelector:] + 239
7 UIKit 0x00564d23 -[UINib instantiateWithOwner:options:] + 1041
8 UIKit 0x00566ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
9 UIKit 0x0041c628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
10 UIKit 0x0041a134 -[UIViewController loadView] + 120
11 UIKit 0x0041a00e -[UIViewController view] + 56
12 UIKit 0x00418482 -[UIViewController contentScrollView] + 42
13 UIKit 0x00428f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
14 UIKit 0x00427555 -[UINavigationController _layoutViewController:] + 43
15 UIKit 0x00428870 -[UINavigationController _startTransition:fromViewController:toViewController:] + 524
16 UIKit 0x0042332a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
17 UIKit 0x0053e2e9 -[UILayoutContainerView layoutSubviews] + 226
18 QuartzCore 0x002a6a5a -[CALayer layoutSublayers] + 181
19 QuartzCore 0x002a8ddc CALayerLayoutIfNeeded + 220
20 QuartzCore 0x002a8ed0 -[CALayer layoutIfNeeded] + 111
21 UIKit 0x0041b58a -[UIViewController window:willAnimateRotationToInterfaceOrientation:duration:] + 587
22 UIKit 0x0039255f -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 4347
23 UIKit 0x00619619 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:] + 1381
24 UIKit 0x0041e65d -[UIViewController presentModalViewController:withTransition:] + 3478
25 DearMe 0x00011ca1 -[NotificationViewController addPasscode] + 273
26 UIKit 0x0036a4fd -[UIApplication sendAction:to:from:forEvent:] + 119
27 UIKit 0x003fa799 -[UIControl sendAction:to:forEvent:] + 67
28 UIKit 0x003fcc2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
29 UIKit 0x003fb7d8 -[UIControl touchesEnded:withEvent:] + 458
30 UIKit 0x0038eded -[UIWindow _sendTouchesForEvent:] + 567
31 UIKit 0x0036fc37 -[UIApplication sendEvent:] + 447
32 UIKit 0x00374f2e _UIApplicationHandleEvent + 7576
33 GraphicsServices 0x015f2992 PurpleEventCallback + 1550
34 CoreFoundation 0x010f9944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
35 CoreFoundation 0x01059cf7 __CFRunLoopDoSource1 + 215
36 CoreFoundation 0x01056f83 __CFRunLoopRun + 979
37 CoreFoundation 0x01056840 CFRunLoopRunSpecific + 208
38 CoreFoundation 0x01056761 CFRunLoopRunInMode + 97
39 GraphicsServices 0x015f11c4 GSEventRunModal + 217
40 GraphicsServices 0x015f1289 GSEventRun + 115
41 UIKit 0x00378c93 UIApplicationMain + 1160
42 DearMe 0x000029df main + 127
43 DearMe 0x00002955 start + 53
44 ??? 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Any ideas about why this might be caused?
EDIT: The code which gives the error:
KVPasscodeViewController *passcodeController = [[KVPasscodeViewController alloc] init];
passcodeController.delegate = self;
UINavigationController *passcodeNavigationController = [[UINavigationController alloc] initWithRootViewController:passcodeController];
[self.navigationController presentModalViewController:passcodeNavigationController animated:YES];
[passcodeNavigationController release];
[passcodeController release];
This is caused because you have an outlet pointing at 'instructionLabel' in the XIB for that view controller.
You have an .xib file that is most likely pointing to a nonexistent label. This typically happens if you add a UILabel in Interface Builder, attach it to your code where instructionLabel exists, then later remove instructionLabel from the code, but forget to update the .xib.
Can anyone help me decipher what's causing my program to crash? I've got a 5 tab bar controller set up, when I load each tab bar, i'm loading a custom table cell with data from a plist file.
this is the error message output to console;
[Session started at 2011-04-28 12:53:05 +0100.]
2011-04-28 12:53:09.344 FiveTabView[62565:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UITableViewController loadView] loaded the "Drinks" nib but didn't get a UITableView.'
*** Call stack at first throw:
(
0 CoreFoundation 0x00db3be9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f085c2 objc_exception_throw + 47
2 CoreFoundation 0x00d6c628 +[NSException raise:format:arguments:] + 136
3 CoreFoundation 0x00d6c59a +[NSException raise:format:] + 58
4 UIKit 0x004c1324 -[UITableViewController loadView] + 275
5 UIKit 0x0036a5e3 -[UIViewController view] + 56
6 UIKit 0x0037d230 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 120
7 UIKit 0x0037bd86 -[UITabBarController transitionFromViewController:toViewController:] + 64
8 UIKit 0x0037db7e -[UITabBarController _setSelectedViewController:] + 263
9 UIKit 0x0037d9ed -[UITabBarController _tabBarItemClicked:] + 352
10 UIKit 0x002bca6e -[UIApplication sendAction:to:from:forEvent:] + 119
11 UIKit 0x004ba1f2 -[UITabBar _sendAction:withEvent:] + 422
12 UIKit 0x002bca6e -[UIApplication sendAction:to:from:forEvent:] + 119
13 UIKit 0x0034b1b5 -[UIControl sendAction:to:forEvent:] + 67
14 UIKit 0x0034d647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
15 UIKit 0x0034b16c -[UIControl sendActionsForControlEvents:] + 49
16 UIKit 0x002bca6e -[UIApplication sendAction:to:from:forEvent:] + 119
17 UIKit 0x0034b1b5 -[UIControl sendAction:to:forEvent:] + 67
18 UIKit 0x0034d647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
19 UIKit 0x0034c1f4 -[UIControl touchesEnded:withEvent:] + 458
20 UIKit 0x002e10d1 -[UIWindow _sendTouchesForEvent:] + 567
21 UIKit 0x002c237a -[UIApplication sendEvent:] + 447
22 UIKit 0x002c7732 _UIApplicationHandleEvent + 7576
23 GraphicsServices 0x016e9a36 PurpleEventCallback + 1550
24 CoreFoundation 0x00d95064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
25 CoreFoundation 0x00cf56f7 __CFRunLoopDoSource1 + 215
26 CoreFoundation 0x00cf2983 __CFRunLoopRun + 979
27 CoreFoundation 0x00cf2240 CFRunLoopRunSpecific + 208
28 CoreFoundation 0x00cf2161 CFRunLoopRunInMode + 97
29 GraphicsServices 0x016e8268 GSEventRunModal + 217
30 GraphicsServices 0x016e832d GSEventRun + 115
31 UIKit 0x002cb42e UIApplicationMain + 1160
32 FiveTabView 0x00002420 main + 102
33 FiveTabView 0x000023b1 start + 53
34 ??? 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Looks like you are calling setValue:forKey: on an object that has been uninitialised (and the memory pointer is pointing elsewhere) or you are actually calling it on the wrong object?
I seem to be having an issue with loading a game on a tab in a tab bar application. When I run the app and click on the tab that the game is supposed to go on, it crashes giving me this in console:
2011-03-20 08:36:29.311 ComputerClan[21592:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x6948f30> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key racquet_green.'
*** Call stack at first throw:
(
0 CoreFoundation 0x017ea5a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0193e313 objc_exception_throw + 44
2 CoreFoundation 0x017ea4e1 -[NSException raise] + 17
3 Foundation 0x001a7677 _NSSetUsingKeyValueSetter + 135
4 Foundation 0x001a75e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
5 UIKit 0x0062b30c -[UIRuntimeOutletConnection connect] + 112
6 CoreFoundation 0x017608cf -[NSArray makeObjectsPerformSelector:] + 239
7 UIKit 0x00629d23 -[UINib instantiateWithOwner:options:] + 1041
8 UIKit 0x0062bab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
9 UIKit 0x004e1628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
10 UIKit 0x004df134 -[UIViewController loadView] + 120
11 UIKit 0x004df00e -[UIViewController view] + 56
12 UIKit 0x004dd482 -[UIViewController contentScrollView] + 42
13 UIKit 0x004edf25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
14 UIKit 0x004ec555 -[UINavigationController _layoutViewController:] + 43
15 UIKit 0x004ed7aa -[UINavigationController _startTransition:fromViewController:toViewController:] + 326
16 UIKit 0x004e832a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
17 UIKit 0x004ef562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932
18 UIKit 0x004e81c4 -[UINavigationController pushViewController:animated:] + 62
19 UIKit 0x004f469a -[UIMoreNavigationController pushViewController:animated:] + 105
20 UIKit 0x004a6b68 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140
21 UIKit 0x0049cb05 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 219
22 Foundation 0x001ae79e __NSFireDelayedPerform + 441
23 CoreFoundation 0x017cb8c3 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
24 CoreFoundation 0x017cce74 __CFRunLoopDoTimer + 1220
25 CoreFoundation 0x017292c9 __CFRunLoopRun + 1817
26 CoreFoundation 0x01728840 CFRunLoopRunSpecific + 208
27 CoreFoundation 0x01728761 CFRunLoopRunInMode + 97
28 GraphicsServices 0x01dda1c4 GSEventRunModal + 217
29 GraphicsServices 0x01dda289 GSEventRun + 115
30 UIKit 0x0043dc93 UIApplicationMain + 1160
31 ComputerClan 0x00002b02 main + 84
32 ComputerClan 0x00002aa5 start + 53
)
terminate called after throwing an instance of 'NSException'
It seems as if you have a problem in the XIB you are trying to load. Make sure there are no invalid connections, i.e. connections to non-existent IBOutlets or IBActions. Also make sure you haven't defined any objects to be non-existent classes.