Permission denied (publickey).

shaifali@ubuntu:/opt/stack/python-glanceclient$ git review
Problem running 'git remote update gerrit'
Fetching gerrit
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
error: Could not fetch gerrit
Traceback (most recent call last):
  File "/usr/local/bin/git-review", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/git_review/cmd.py", line 1202, in main
    set_hooks_commit_msg(remote, hook_file)
  File "/usr/local/lib/python2.7/dist-packages/git_review/cmd.py", line 283, in set_hooks_commit_msg
    run_command_exc(CannotInstallHook, *cmd)
  File "/usr/local/lib/python2.7/dist-packages/git_review/cmd.py", line 152, in run_command_exc
    raise klazz(rc, output, argv, env)
git_review.cmd.CannotInstallHook: Problems encountered installing commit-msg hook
The following command failed with exit code 1
    "scp -P29418 shaifali@review.openstack.org:hooks/commit-msg .git/hooks/commit-msg"
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Permission denied (publickey).
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