Git Errors

gistfile1.txt

** loading stage recipe 'deploy'
 ** loading stage recipe 'init_config'
 ** loading stage recipe 'nginx'
 ** loading stage recipe 'post_deploy_unicorn_test'
 ** loading stage recipe 'unicorn'
    executing locally: "git ls-remote git@github.com:XXXXXXXXXX/XXXXXXXXXXX.git unicorn_test"
*** Could not save revision: Command git ls-remote git@github.com:XXXXXXXXXX/XXXXXXXXXXX.git unicorn_test returned status code pid 23267 exit 128
  * executing `deploy'
  * executing `deploy:update'
 ** transaction: start
  * executing `deploy:update_code'
    updating the cached checkout on all servers
    executing locally: "git ls-remote git@github.com:XXXXXXXXXX/XXXXXXXXXXX.git unicorn_test"
*** [deploy:update_code] rolling back
  * executing "rm -rf /data/unicorn_test/staging/releases/20120917221825; true"
    servers: ["ec2-81-243-196-157.compute-1.amazonaws.com", "ec2-81-243-205-119.compute-1.amazonaws.com"]
    [ec2-81-243-196-157.compute-1.amazonaws.com] executing command
    [ec2-81-243-205-119.compute-1.amazonaws.com] executing command
    command finished in 459ms
*** Command git ls-remote git@github.com:XXXXXXXXXX/XXXXXXXXXXX.git unicorn_test returned status code pid 23270 exit 128