Describes the cause and action for error messages.
Error Message(English)：
project is already on github intellij
Delete Github integration ? IDEs Support (IntelliJ Platform) | JetBrains
https://intellij-support.jetbrains.com/hc/en-us/community/posts/206840985-Delete-Github-integration
How to import GITHUB project in IntelliJ IDEA - YouTube
https://www.youtube.com/watch?v=DRKrzN0LwUw
https://www.youtube.com/watch?v=DRKrzN0LwUw
Adding a Project to Git and GitHub - YouTube
https://www.youtube.com/watch?v=mf2-MOl0VXY
https://www.youtube.com/watch?v=mf2-MOl0VXY
How should I add my intelliJ project to an already existing Github ...
https://stackoverflow.com/questions/40741742/how-should-i-add-my-intellij-project-to-an-already-exis・・・
Adding GitHub Wiki to IntelliJ Project ・ vsch/idea-multimarkdown Wiki ...
https://github.com/vsch/idea-multimarkdown/wiki/Adding-GitHub-Wiki-to-IntelliJ-Project
"The project is already registered" during import ・ Issue #188 ... - GitHub
https://github.com/pantsbuild/intellij-pants-plugin/issues/188
intellij-rust/intellij-rust - GitHub
https://github.com/intellij-rust/intellij-rust/issues/1570