Describes the cause and action for error messages.
Error Message(English):
email is already in use
validateUsername() reports 'Users is already in use' when ... - GitHub
https://github.com/colinskow/ng-superlogin/issues/10
[ERROR] user#signup (ActiveRecord::RecordInvalid ... - GitHub
https://github.com/mysociety/alaveteli/issues/4947
Bypass social signup for existing account ・ Issue #1149 ... - GitHub
https://github.com/pennersr/django-allauth/issues/1149
7日目: github.comはuser.emailをみてauthorが誰か判定しています(user ...
http://kimikimi714.hatenablog.com/entry/2013/12/07/7%E6%97%A5%E7%9B%AE%3A_github_com%E3%81%AFuser_em・・・
Admin Authentication API Errors | Firebase
https://firebase.google.com/docs/auth/admin/errors
GitHub - Contributor count still 1? - Stack Overflow
https://stackoverflow.com/questions/35027655/github-contributor-count-still-1
Unable to create Samsung account - email already in use!? - General ...
https://community.smartthings.com/t/unable-to-create-samsung-account-email-already-in-use/102830
can't add users to webid | WeBid Support
http://www.webidsupport.com/forums/index.php?threads/cant-add-users-to-webid.10179/
“Username or password is incorrect” is bullshit | Hacker News
https://news.ycombinator.com/item?id=15986217