An error has occurred. Unable to import an item. The contents of this item cannot be retrieved. Missing .pem file
Solution 1:
Quoting http://www.openradar.me/7092640:
You can use the 'security' command line tool:
security import priv_key.p12 -k ~/Library/Keychains/login.keychain
security import pub_key.pem -k ~/Library/Keychains/login.keychain
https://stackoverflow.com/a/16847082/14731 contains a similar answer.
Solution 2:
1., open Keychain Access. 2., On the Keychains panel right click on login. Select Lock Keychain "login". 3., Then unlock it. Then the import should work.