Back to Error DirectoryW3C EPUBCheck Standard
OPF-077Critical Ingestion Error

A Data Navigation Document should not be included in the spine.

A Data Navigation Document should not be included in the spine.

Automated 1-Click Fix Ready

Fix all OPF-077 errors in your EPUB automatically

PreFlight checks for OPF-077 issues in memory and provides 1-click remediation during client-side packaging.

Scan & Fix Now

What This Error Means in Plain English

EPUBCheck detected A Data Navigation Document should not be included in the spine.. 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-077: A Data Navigation Document should not be included in the spine.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-077 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-077 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.