How to do fix Authentication failed error on remote repository

[Sanele Malumbazo]

I am getting this error on my Soucetree after updating a password for bitbucket

  git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v --tags origin testgsep:testgsep
fatal: credential-cache unavailable; no unix socket support
fatal: credential-cache unavailable; no unix socket support
fatal: Authentication failed for 'https://gsep.daimler.com/stash/scm/intotnt/systemtest.git/'
Pushing to https://gsep.daimler.com/stash/scm/intotnt/systemtest.git
Completed with errors, see above.

I Can access the endpoints on browser but get the error when pushing on Sourcetree 

[Jesse Rond]

I wasn't having any luck with the previous solutions.  What finally fixed it for me was going to Tools -> Options -> Git, and then clicking the "Update Embedded."  Also, I heard that if that didn't work, clicking the "System" button (which switches you from SourceTree's embedded Git over to a System Git) may work as well.