Github Windows 'Failed to sync this branch'
When it says that, just open the shell and do git status. That will give you a decent idea of what could be wrong and the state of your repo.
I can't give you a specific error for this as it happens for many reasons in Github for Windows, like say some problem in updating submodules etc.
This error comes because of a merge conflict in files. I faced it after I had updated my Maven Project's pom.xml but didn't commit it. Using
git statuserror: Your local changes to the following files would be overwritten by merge:<my project>/pom.xmlPlease, commit your changes or stash them before you can merge.Abortingas the above post suggested helped finding any conflicting changes and you can decide to discard or commit.
I had the same problem. It happened to me because of some conflicting changes. I removed the local repository of my project from my desktop and then cloned it again from the github website (using clone option in my account), the error was gone.