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https://discussions.apple.com/thread/4167425?start=0&tstart=0

SEONI

I have just followed these instructions posted by lamboman2008on Apr 11, 2012 6:27 PM

 
BE AWARE... please note:  This deletes ALL of your contacts and if you have set them up in iCloud or suchlike you are able to, like it says above repopulate or import your contacts.
 
EUREKA! I've figured it out!

 
Quit Address Book
Go to ~/Library/Application Support/
Delete the entire "AddressBook" folder
Open Address Book and wait 30sec for the address book to automatically repopulate
...
PROFIT!!

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Structurer
Re: Cannot edit or delete in Mountain Lion Contacts
Feb 6, 2013 1:46 PM (in response to GongShowNB)
This contacts problem had been driving me crazy for months, so it was finally time to look for a fix...

The Library folder is hidden, so make sure you enable hidden folders.
 
Also, just to be clear, there are two Library/Application Support/ folders.  One is at the top root level and the other is at your user name level.  You want the latter one.

The above solution worked for me, so thank you Seonie! 

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Daniel Ebeck	London UK
This helped meRe: show hidden folder
Apr 4, 2012 6:33 AM (in response to dgrobot)
Hold the Option key and click the Go menu. The Library will appear. Then you can make an alias to it.