Failed to push some refs to

error: failed to push some refs to
error: failed to push some refs to... error: failed to push some refs to...
Summarize the causes and solutions
No code submitted
You can use git status to see if you forgot to commit your code. If you forget, just submit it.

  git add .
  git commit -m "This is a new commit"
  git push origin master

Conflicts arise between local and remote

    strong coverage 

      git push -f origin master
      first back to pull 
      git pull –-rebase origin maste
  git push origin master

    record