# EPUBCheck CHK-001: The custom message overrides file was…

Source: https://epublab.com/epubcheck/chk-001/ (updated 2026-11-03)

EPUBCheck CHK-001 is an error message: “The custom message overrides file was not found.” EPUBCheck could not find the custom message file passed with -c.

- Official message (EPUBCheck 5.4.0): The custom message overrides file was not found.
- Default severity: Error

## Typical causes

- A wrong path to the file, or a file that was moved.

## How to fix it

- This is a problem with the file passed to EPUBCheck's -c (--customMessages) option, not with the EPUB. Fix the custom message file or run EPUBCheck without -c.
- To start from a correct file, run EPUBCheck with -l (--listChecks) to write the list of message IDs and their severities, then edit that list.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.