Back to Error DirectoryW3C EPUBCheck Standard
MED-011Retailer Warning

EPUB Content Document referenced from multiple Media Overlay Docume...

EPUB Content Document referenced from multiple Media Overlay Documents.

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Fix all MED-011 errors in your EPUB automatically

PreFlight checks for MED-011 issues in memory and provides 1-click remediation during client-side packaging.

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What This Error Means in Plain English

EPUBCheck detected EPUB Content Document referenced from multiple Media Overlay Documents.. Digital reading systems and bookstores require standard conformance to ensure compatibility across all reading apps.

Why Retailers & EAA Regulations Block This File

Automated book distributors (Apple Books, Amazon KDP, Kobo, and IngramSpark) run strict EPUBCheck validation on ingest and reject non-compliant files.

Technical Specification: W3C EPUBCheck rule MED-011: EPUB Content Document referenced from multiple Media Overlay Documents.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule MED-011 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the MED-011 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.