# Troubleshooting

- [How to fix "Couldn't obtain plugin principle class"](/classic-manual/user-manual/troubleshooting/how-to-fix-couldnt-obtain-plugin-principle-class.md)
- [How to Diagnose an Issue](/classic-manual/user-manual/troubleshooting/how-to-diagnose-an-issue.md)
- [How to Report a Bug](/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](/classic-manual/user-manual/troubleshooting/how-to-locate-your-addons-and-preferences.md): Locate addons, preferences, and projects
- [Help with "plugin is missing" message.](/classic-manual/user-manual/troubleshooting/help-with-plugin-is-missing-message..md)
- [How to Send or Share Your Project (moved)](/classic-manual/user-manual/troubleshooting/how-to-send-or-share-your-project-moved.md)