error: failed to push some refs to 'git@github.com:....." Updates were rejected because the remote contains work that you do not have locally. This is usually caused by another repository pushing to

造成这个错误是因为我在github上修改了自己的文件，在上传本地文件之前没有把github上的文件拉倒本地，

意思是本地和远程的文件应该合并后才能上传本地的新文件

具体方法：

1、先拉下来，会自动合并的（不用操心）

git pull origin master

2、再上传

git push -u origin master