Git error： hint: Updates were rejected because the remote contains work that you do hint: not have locally. This is usually caused b 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.
Solution:
$ git pull origin master
$ git push origin master