Back to Error DirectoryW3C EPUBCheck Standard
PKG-007.whitespaceCritical Ingestion Error

with no whitespace or newline.

with no whitespace or newline.

Automated 1-Click Fix Ready

Fix all PKG-007.whitespace errors in your EPUB automatically

PreFlight checks for PKG-007.whitespace 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 with no whitespace or newline.. 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-007.whitespace: with no whitespace or newline.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule PKG-007.whitespace in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the PKG-007.whitespace specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.