El Capitan installed and all contacts are gone

my husband installed El Capitan ame lost all his contacts in the phonebook. How can we bring them back?

Has invited:

howapple - hello

Favor from:

Did you try to deselect contacts and then reselect it? When I opened contacts I was already signed in and contacts was selected. I then deselected contents and reselected it. I then shut down messages (because it was already open on my computer) and closed it. When I did this, all of my contacts returned and my messages were properly identified.

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