Back to Error DirectoryW3C EPUBCheck Standard
NAV-011Retailer Warning

"resource" nav must be in reading order; link target "resource" is ...

"resource" nav must be in reading order; link target "resource" is before the previous link’s target in resource order.

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What This Error Means in Plain English

EPUBCheck detected "resource" nav must be in reading order; link target "resource" is before the previous link’s target in resource order.. 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 NAV-011: "resource" nav must be in reading order; link target "resource" is before the previous link’s target in resource order.

Manual Fix Instructions (for Sigil / Calibre)

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