Im trying to push to github with sourcetree but get the following error:
git -c diff.mnemonicprefix=false -c core.quotepath=false push -v --tags origin
For SourceTree 2.7.6 for macOS using embedded git I followed all the suggested answers but still had the same problem.
The solution for me was to turn off two factor authentication.
Obviously not ideal, but sometimes you just need to get your work done.