Getting error 'Git failed with a fatal error' in Visual Studio 2017 when using Git for windows

I had similar issue while working in Visual Studio 2017 community edition, and was able to resolve after following  these steps

1. Navigate to C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\ and delete the Git folder.

2. Make sure that there is no version of Git installed on your system, remove it by going to Control Panel > Program and Features (no need to remove tortoise git)

3. Open up the VS 2017 installer and untick "Git For Windows" in installation options.

4. Head over to the git website and install the latest version of Git For Windows.

5. Go back into the VS installer and tick "Git for Windows" again, it will not download a new version even though it may look like it is. After that is done your git should be fine with VSTS and TF Explorer.

Source

OR

This Error can also occur if there is any error in code, you can simply revert code and try again, this may also work in some cases.

You can also try this solution, in Windows -> Control Panel -> All Control Panel Items ->Credential Manager -> Windows Credentials -> Remove Git:http://........

and Retry, this may work.