Currently Being ModeratedMar 12, 2013 6:24 AM (in response to JustinIllig)
This worked for me. Thanks Justin.
1. click on mac HD/ libraray /caches. drag all the contents in the folder to the trash
2. click on the finder click go, hold the option key and clikc on libraries (will not appear if you don't hold the option key). go to the caches folder again and again drag everything in the folder to the trash.
3. click on the finder click go, hold the option key and clikc on containers. Drag com.apple.notes to the trash
4. restart your computer.
5. empty trash.
6. try to open notes again
Currently Being ModeratedMay 20, 2013 12:00 PM (in response to Robet Rackl)
Worked for me as well, had two ~/Library/Containers/com.apple.Notes/Data/Library/Notes/ folders and deleted one (Notes) to rid my self of the two icloud account problem. Rechecked iCloud account and all notes returned. Make sure to move all notes to active iCloud account and check sync before doing this.
Currently Being ModeratedJul 19, 2013 10:34 AM (in response to arzboy)
Process: Notes 
Version: 1.5 (107)
Build Info: Notes-107000000000000~3
Code Type: X86-64 (Native)
Parent Process: launchd 
User ID: 501
Date/Time: 2013-07-19 12:33:39.235 -0500
OS Version: Mac OS X 10.8.4 (12E55)
Report Version: 10
Interval Since Last Report: 359983 sec
Crashes Since Last Report: 9
Per-App Interval Since Last Report: 7 sec
Per-App Crashes Since Last Report: 9
Anonymous UUID: AE416A17-5C9A-DC6E-5228-DBA27EB4130D
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<SharingController 0x7f9cf3a360e0> addObserver:<NSKeyValueObservance 0x7f9cf3c09970> forKeyPath:@"delegate.sharedNote" options:256 context:0x0] was sent to an object that is not KVC-compliant for the "delegate" property.'
terminate called throwing an exception
Tried every solution I read in all support treads ... NOTHING WORKS!?!?! ANYONE?!?!
Currently Being ModeratedJul 20, 2013 8:01 PM (in response to Paul Taroli*)
So I went to the Genius Desk today. They suggested that I reload Mountain Lion...after back up of course. So I did and it worked...Notes is now working again.
There you go...took about 3-4 hours depending on your connection...I suggest ethernet when doing the Lion re-install.
Currently Being ModeratedJan 28, 2014 12:27 PM (in response to Miles Cortez)
I did all this, and then realized (too late) that I was not backed-up by Icloud. Now -- Notes does open up (was continuously crashing), but all notes content is gone. I did not empty trash with com.apple.notes and other files/ folder and now have on my desktop, but can't seem to place it back correctly to bring back Notes content when relaunching.
There are several of these com.apple.notes folders I see in various places in Container-- so perhaps I am not deleting newer ones, and putting old one back correctly -- and I can see the folders there currently do not have much in them (KB), indicating that they are not the original Notes data (I had over 200 some notes). Folders I do have saved to put back is com.apple.Notes folder with file cache.db-wal which is 3.1MB in size. Also Notes folder with a file NotesV1.storedata-wal which is 4.1MB size.
Any advise on how/where to replace com.apple.notes and Notes folder mentioned above -- to restore original Notes data. Before I emptied out the cache's and container folder -- I was at least able to find the individual Notes documents via Spotlight search -- but now Notes program has not content, and nothing shows on Spotlight search.
I hope the notes content is not lost forever. Can you help?