# EPUBCheck RSC-025: informative parser error, how to fix it

Source: https://epubcc.com/epubcheck/rsc-025/ (updated 2026-11-04)

EPUBCheck RSC-025 is a usage message: “Informative parsing error: ….” The parser reported an informative parsing error about a file. It is a usage message, shown only with -u, so EPUBCheck does not count it against the EPUB; the text after the colon is the parser's description.

- Official message (EPUBCheck 5.4.0): Informative parsing error: %1$s
- Default severity: Usage

## Typical causes

- Problems the parser reports in a context where EPUBCheck treats them as information only.
- Notes from the underlying parser that EPUBCheck passes through.

## How to fix it

1. Read the text after the colon, with the file, line and column.
2. If it describes a real mistake in your markup, fix it: other tools may be stricter.
3. Validate again without -u to be sure no error remains.

## When it's not this

Parsing errors that make the EPUB invalid are reported as RSC-005 or the fatal RSC-016.

## Sources

- EPUBCheck 5.4.0 message texts (MessageBundle.properties, w3c/epubcheck on GitHub): https://github.com/w3c/epubcheck/blob/v5.4.0/src/main/resources/com/adobe/epubcheck/messages/MessageBundle.properties (read 2026-11-04)
- EPUBCheck wiki: Running EPUBCheck (command-line options): https://github.com/w3c/epubcheck/wiki/Running (read 2026-11-04)

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