Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
*** [deploy:update_code] rolling back
  * executing "rm -rf /var/www/app/releases/20140327233712; true"
    servers: ["IP"]
    [IP] executing command
    command finished in 676ms
Command git ls-remote git@bitbucket.org:user/app.git staging returned status code pid 5458 exit 128