# EPUBCheck OPF-016: The element rootfile is missing its…

Source: https://epublab.com/epubcheck/opf-016/ (updated 2026-11-03)

EPUBCheck OPF-016 is an error message: “The element "rootfile" is missing its required attribute "full-path".” A rootfile element in META-INF/container.xml has no full-path attribute, so it does not say where the package document is.

- Official message (EPUBCheck 5.4.0): The element "rootfile" is missing its required attribute "full-path".
- Default severity: Error

## Typical causes

- A hand-written container.xml missing the attribute.

## How to fix it

- Add full-path with the package document's path from the root of the archive, for example full-path="OEBPS/content.opf".

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