title: Error when sending a pull request to GitHub
body: <p>So I'm very new to Github, and I'm using it for a Unity project with some friends who have also never used it before (We're using the Github API). We have it all set up and working, been going well for awhile now creating branches and making pull requests and such.</p>
  
  <p>Now I have been working on a branch in which I created about 5 new Unity scenes and scripts. I tried sending a pull request to merge it with the master branch, but every time I try Github API freezes for a few hours and then throws an error, saying "Could not create pull request" and "Try manually synchronizing the current branch as well as the target branch and try again. If this error persists please email support@github.com.". Well, that would help if I even knew what "manually synchronizing the current branch as well as the target branch" means. Is it somehow wanting me to merge the branch in question with my local master (Which I don't know how to do) and then sync with the remote repo? I don't understand. Help please!</p>