I tried lots of times but all failed. My steps shows below
add SSH key from cloud9 at my github and connect cloud 9 with my github
new a repo called
git@github.com:XXX/XXX.git
enter the file in cloud 9
git remote add origin git@github.com:XXX/XXX.git
git push -u origin master
Warning: Permanently added 'github.com,192.30.253.112' (RSA) to the list of known hosts. To git@github.com:XXX/XXX.git ! [rejected] master -> master (fetch first) error: failed to push some refs to 'git@github.com:XXX/XXX.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.
Can some one help me? Thanks a lot!