App crashing on first use of UIImagePickerController - ios

Question

I am trying to use a UIImagePickerController in my app and am getting a crash after being prompted for access to the photo album for the first time. Here is the crash error:
[PUUIAlbumListViewController requiresAuth]: unrecognized selector sent to instance 0xd6a18b0
I can't find any references to this error anywhere. Anyone have any clues? Thanks!
-(void)showPicker
{
self.imagePicker = [[UIImagePickerController alloc]init];
self.imagePicker.delegate = self;
self.imagePicker.allowsEditing = NO;
self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
self.imagePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:self.imagePicker animated:YES completion:nil];
}
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PUUIAlbumListViewController requiresAuth]: unrecognized selector sent to instance 0xd1587d0'
*** First throw call stack:
(
0 CoreFoundation 0x03bcb5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x0394e8b6 objc_exception_throw + 44
2 CoreFoundation 0x03c68903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x03bbb90b ___forwarding___ + 1019
4 CoreFoundation 0x03bbb4ee _CF_forwarding_prep_0 + 14
5 MyApp Mobile 0x000042e8 -[MyAppDelegate applicationDidBecomeActive:] + 2989
6 UIKit 0x027afef4 -[UIApplication _stopDeactivatingForReason:] + 329
7 UIKit 0x027b5afb _alertItemStateChanged + 81
8 CoreFoundation 0x03c27733 __CFNotificationCenterAddObserver_block_invoke + 163
9 CoreFoundation 0x03c27524 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
10 CoreFoundation 0x03c277fd ____CFXNotificationPostToken_block_invoke + 173
11 CoreFoundation 0x03b8a1c0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 16
12 CoreFoundation 0x03b533f9 __CFRunLoopDoBlocks + 361
13 CoreFoundation 0x03b71843 __CFRunLoopRun + 2355
14 CoreFoundation 0x03b70ac3 CFRunLoopRunSpecific + 467
15 CoreFoundation 0x03b708db CFRunLoopRunInMode + 123
16 GraphicsServices 0x0477f9e2 GSEventRunModal + 192
17 GraphicsServices 0x0477f809 GSEventRun + 104
18 UIKit 0x027b6d3b UIApplicationMain + 1225
19 MyApp 0x00166361 main + 264
20 libdyld.dylib 0x0431e725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

It looks like the crash wasn't related to UIImagePickerController directly, but was occurring in the appdelegate on applicationDidBecomeActive when calling a selector on self.navigationController.visibleViewController without checking to see if the visibileViewController responded to the selector.

Answer 2

Somewhere your code is looking for a method: requiresAuth in your class: PUUIAlbumListViewController. It's not there. Code the missing method or remove the call to it.