Back to Error DirectoryW3C EPUBCheck Standard
OPF-097Critical Ingestion Error

Resource "resource" is listed in the manifest, but no reference to ...

Resource "resource" is listed in the manifest, but no reference to it was found in content documents.

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Fix all OPF-097 errors in your EPUB automatically

PreFlight checks for OPF-097 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 Resource "resource" is listed in the manifest, but no reference to it was found in content 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 OPF-097: Resource "resource" is listed in the manifest, but no reference to it was found in content documents.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-097 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-097 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.