Raw error output:
Unexpected error while pushing to firefox-autoland.
Error running git command; sanitised_command=['git', 'push', 'https://[REDACTED]@github.com/mozilla-firefox/firefox.git', 'HEAD:autoland'], path='/files/repos/firefox-autoland', To https://github.com/mozilla-firefox/firefox.git
 ! [rejected]                  HEAD -> autoland (fetch first)
error: failed to push some refs to 'https://github.com/mozilla-firefox/firefox.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.