# EPUBCheck OPF-011: page on both spread sides, how to fix it

Source: https://epubcc.com/epubcheck/opf-011/ (updated 2026-11-04)

EPUBCheck OPF-011 is an error message: “itemref can’t have both page-spread-right and page-spread-left properties.” A spine itemref has both the page-spread-right and page-spread-left properties. They tell a reading app on which side of a two-page spread the page goes, so having both is a contradiction and EPUB forbids it.

- Official message (EPUBCheck 5.4.0): itemref can’t have both page-spread-right and page-spread-left properties.
- Default severity: Error

## Typical causes

- Properties added twice, by hand or by a tool, when setting up a fixed-layout spread.
- An itemref copied from a neighbouring page and edited without removing the old side.
- A script that appends a spread property without checking for an existing one.

## How to fix it

1. Open the spine in the package document and find the itemref EPUBCheck points to.
2. Decide on which side the page should appear in a spread.
3. Keep only that property, for example <itemref idref="p12" properties="page-spread-left"/>, and delete the other.

## When it's not this

If the spread property is on reflowable content, EPUBCheck reports OPF-100 instead.

## Sources

- EPUB 3.3, §D.7.1 page-spread-left: https://www.w3.org/TR/epub-33/#sec-page-spread-left (read 2026-11-04)
- EPUB 3.3, §5.7.2 The itemref element: https://www.w3.org/TR/epub-33/#sec-itemref-elem (read 2026-11-04)

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