Since trying to update yesterday, my computer won't download any updates and itunes 11.1 says "Internal Error" and gives me the following info when I click on a song or podcast: Exception Name: NSInvalidArgumentException Description: -[_NSConcreteUserNoti

Question

Since trying to update yesterday, my computer won't download any updates and itunes 11.1 says "Internal Error" and gives me the following info when I click on a song or podcast:
Exception Name: NSInvalidArgumentException
Description: -[_NSConcreteUserNotification activationType]: unrecognized selector sent to instance 0x25a06b0
User Info: (null)
0   CoreFoundation                      0x922216fb __raiseError + 219
1   libobjc.A.dylib                     0x920108db objc_exception_throw + 230
2   CoreFoundation                      0x9222563d -[NSObject(NSObject) doesNotRecognizeSelector:] + 253
3   CoreFoundation                      0x9216af77 ___forwarding___ + 487
4   CoreFoundation                      0x9216ad22 _CF_forwarding_prep_0 + 50
5   iTunes                              0x00df38e2 iTunes + 14624994
6   iTunes                              0x00df36ae iTunes + 14624430
7   libobjc.A.dylib                     0x9201c6c5 -[NSObject performSelector:withObject:withObject:] + 77
8   Foundation                          0x93c12d85 -[_NSConcreteUserNotificationCenter _sendDelegateMessage:sendToAppDelegate:withNotificationFromMessage:] + 335
9   Foundation                          0x93c12eaf -[_NSConcreteUserNotificationCenter _notificationPresentedMessage:] + 58
10  Foundation                          0x93c137c2 __block_global_1 + 156
11  libdispatch.dylib                   0x9371b2cf _dispatch_call_block_and_release + 15
12  libdispatch.dylib                   0x9371ea80 _dispatch_client_callout + 46
13  libdispatch.dylib                   0x9371c8e8 _dispatch_main_queue_callback_4CF + 223
14  CoreFoundation                      0x9211b255 __CFRunLoopRun + 1829
15  CoreFoundation                      0x9211a7c4 CFRunLoopRunSpecific + 308
16  CoreFoundation                      0x9211a67b CFRunLoopRunInMode + 123
17  HIToolbox                           0x90b6fc76 RunCurrentEventLoopInMode + 242
18  HIToolbox                           0x90b76eb9 ReceiveNextEventCommon + 374
19  HIToolbox                           0x90b76d34 BlockUntilNextEventMatchingListInMode + 88
20  AppKit                              0x97621923 _DPSNextEvent + 709
21  AppKit                              0x97621167 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 119
22  AppKit                              0x9761d78c -[NSApplication run] + 855
23  iTunes                              0x0017a898 iTunes + 1546392
24  iTunes                              0x0017a709 iTunes + 1545993
25  ???                                 0x00000002 0x0 + 2

Answer 1

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models.  The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.