How can I fix the error: fatal: could not read Username for 'https://github.com': Device not configured

[Harald Maier]

HI, does anybody know how to fix this error:

fatal: could not read Username for 'https://github.com': Device not configured

...during merge:

Errors during merge

Switched to branch 'master'

Switched to branch 'develop'

fatal: could not read Username for 'https://github.com': Device not configured

Could not push to develop from origin.

[Ronald DiFrango]

I'm seeing something similar and have yet to find a resolution with the URL removed as its an internal private GitHub instance:

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree push -v --tags origin refs/heads/development:refs/heads/development refs/heads/master:refs/heads/master 
Pushing to https://<my URL>/<REPO>.git
error: git-credential-sourcetree died of signal 5
fatal: could not read Username for 'https://<my URL>': Device not configured
Completed with errors, see above

I'm on OS X Yosemite with the git version:

git version 2.3.2 (Apple Git-55)

[stevestreeting]

He's using HTTPS so SSH keys aren't related.

I haven't seen this but I've Googled some reports of this when installing your own system git and using the 'credential-osxkeychain' extension to get the command-line git to use OSX's keychain to log in over HTTPS links. You don't need that extension to work with SourceTree, it provides its own integration with the keychain, so if you've done this it would be worth disabling it to see if that helps.

[KieranA]

Just as a quick, have you set your public/private keys up correctly?