# EPUBCheck RSC-017: Warning while parsing file: …

Source: https://epublab.com/epubcheck/rsc-017/ (updated 2026-11-03)

EPUBCheck RSC-017 is a warning message: “Warning while parsing file: ….” The parser found something questionable that does not stop it from reading the file.

- Official message (EPUBCheck 5.4.0): Warning while parsing file: %1$s
- Default severity: Warning

## Typical causes

- Constructs that are allowed but discouraged or suspicious; the text after the colon names it.

## How to fix it

- Read the text after the colon: EPUBCheck reports the file, the line and column, and the parser's own description of the problem.
- Fix it if the message points at a real mistake; it does not make the EPUB invalid on its own.

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