android studio github error (non-fast-forward)

출처 : http://stackoverflow.com/questions/11696295/rejected-master-master-non-fast-forward

1) Try this: git push -f origin master

2) ! [rejected] master -> master (non-fast-forward)

Don’t panic, this is extremely easy to fix. All you have to do is issue a pull and your branch will be fast-forward:

$ git pull myrepo master

Then retry your push and everything should be fine:

$ git push github master