Back to Error DirectoryW3C EPUBCheck Standard
RSC-008Critical Ingestion Error

Referenced resource "resource" is not declared in the OPF manifest.

Referenced resource "resource" is not declared in the OPF manifest.

Automated 1-Click Fix Ready

Fix all RSC-008 errors in your EPUB automatically

PreFlight checks for RSC-008 issues in memory and provides 1-click remediation during client-side packaging.

Scan & Fix Now

What This Error Means in Plain English

EPUBCheck detected Referenced resource "resource" is not declared in the OPF manifest.. 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 RSC-008: Referenced resource "resource" is not declared in the OPF manifest.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule RSC-008 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the RSC-008 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.