Back to Error DirectoryW3C EPUBCheck Standard
PKG-011Critical Ingestion Error

The file name "resource" is not allowed to end with ".".

The file name "resource" is not allowed to end with ".".

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Fix all PKG-011 errors in your EPUB automatically

PreFlight checks for PKG-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 The file name "resource" is not allowed to end with ".".. 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 PKG-011: The file name "resource" is not allowed to end with ".".

Manual Fix Instructions (for Sigil / Calibre)

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