> For the complete documentation index, see [llms.txt](https://docs.klai.studio/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.klai.studio/engineering-reference-docs/betterforms-error-pages-api/introduction.md).

# Introduction

This document covers the system static and app dynamic error pages and how they work. The static error page is a non-customizable page that will be shown for lower level errors (e.g. BF server, network, providers errors), and the app dynamic error page is shown for some higher-level errors (e.g. page not found, request timeout, and some FM errors like Invalid Data API token).