> For the complete documentation index, see [llms.txt](https://docs.realmacsoftware.com/classic-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting.md).

# Troubleshooting

- [How to fix "Couldn't obtain plugin principle class"](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/how-to-fix-couldnt-obtain-plugin-principle-class.md)
- [How to Diagnose an Issue](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/how-to-diagnose-an-issue.md)
- [How to Report a Bug](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/how-to-report-a-bug.md): If you've found an issue, here's what to do
- [How to Locate Your Addons and Preferences](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/how-to-locate-your-addons-and-preferences.md): Locate addons, preferences, and projects
- [Help with "plugin is missing" message.](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/help-with-plugin-is-missing-message..md)
- [How to Send or Share Your Project (moved)](https://docs.realmacsoftware.com/classic-manual/user-manual/troubleshooting/how-to-send-or-share-your-project-moved.md)