Describes the cause and action for error messages.
Error Message(English)：
desktop fatal invalid reference
Invalid reference error in Pull Request list after deleting a ... - GitHub
https://github.com/desktop/desktop/issues/3453
Git fatal: invalid reference: master - LinuxQuestions
https://www.linuxquestions.org/questions/linux-virtualization-and-cloud-90/git-fatal-invalid-referen・・・
Gitで"fatal: Reference has invalid format.." - ゲレゲレめも
http://d.hatena.ne.jp/gelegele/20120530/git_dropbox_fatal
Git push: "fatal 'origin' does not appear to be a git repository ...
https://stackoverflow.com/questions/32238616/git-push-fatal-origin-does-not-appear-to-be-a-git-repos・・・
Attempting to start git bisect gives 'fatal: invalid reference ...
https://stackoverflow.com/questions/27750272/attempting-to-start-git-bisect-gives-fatal-invalid-refe・・・
fatal: Not a valid object name: 'master'
https://stackoverflow.com/questions/9162271/fatal-not-a-valid-object-name-master
Git fatal: Reference has invalid format: 'refs/heads/master ...
https://stackoverflow.com/questions/12773488/git-fatal-reference-has-invalid-format-refs-heads-maste・・・
git pull origin master returns fatal: invalid refspec
https://stackoverflow.com/questions/19439501/git-pull-origin-master-returns-fatal-invalid-refspec
fatal: Not a valid object name: 'master' - Stack Overflow
https://stackoverflow.com/questions/9162271/fatal-not-a-valid-object-name-master/9162347