git push报错error: failed to push some refs to '[e-mail]:

$ git push -u origin masterTo [e-mail]:xxx/xxx.git ! [rejected]        master -> master (fetch first)error: failed to push some refs to '[e-mail]:xxx/xxx.git'hint: Updates were rejected because the remote contains work that you dohint: not have locally. This is usually caused by another repository pushinghint: to the same ref. You may want to first integrate the remote changeshint: (e.g., 'git pull ...') before pushing again.hint: See the 'Note about fast-forwards' in 'git push --help' for details.
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原因： 
GitHub远程仓库中的README.md文件不在本地仓库中。 
解决方案：

$ git pull --rebase origin master$ git push -u origin master