> For the complete documentation index, see [llms.txt](https://xriddle.gitbook.io/popai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xriddle.gitbook.io/popai/error-message.md).

# Error Message

When an error message is returned after sending a message, it is usually due to one of the following reasons:

1. The API KEY is not set or is incorrect.
2. The API KEY credit balance is insufficient.
3. The content of the user's message violates LLM regulations.
4. There is an issue with the selected model.
5. The API provider's server is experiencing operational issues.
6. Network issues.