VisualStudio: An error was raised by libgit2. Category = Checkout

For resolving the issue follow below steps:-

1)Close visual studio.
2)Now Open visual studio without opening any solution..
3)Open team viewer and then go to git home->changes..
4)Then click on commit..
5)Now you will get the unresolved conflicts..
6)Resolve the conflicts and commit..

Problem Resolved :).
Cheers

Sadly, the Visual Studio plugin for Git doesn't display the error messages you need to troubleshoot this problem. (I hope they plan that feature for a later release.)

Try pulling the latest commits using Git Bash or using TortoiseGit. Either of those tools should let you know where your conflicts are.

To see the error you should run git command line You can find it at Team Emplorer -> Unsynched commits -> Actions -> Open in Command Prompt

Then you should use git pull command

Be careful with credential if you are using visualstudio.com, in this case you must have an alternative login and password for connect to git from command prompt.