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

# Troubleshooting

- [Debug mode](https://docs.projectsend.org/about/troubleshooting/debug-mode.md): This is the first step you must take when your instance is returning errors (400, 500) or something just simply does not respond the way you expect
- [Checking php errors](https://docs.projectsend.org/about/troubleshooting/checking-php-errors.md)
- [Finding and reporting bugs](https://docs.projectsend.org/about/troubleshooting/finding-and-reporting-bugs.md)
- [How to get support](https://docs.projectsend.org/about/troubleshooting/how-to-get-support.md)
- [Collaborate](https://docs.projectsend.org/about/troubleshooting/collaborate.md)