File Cannot Be Read: Blocker

Message received: This file could not be opened. It may be damaged or not a valid PDF.

Alert level: Blocker. This blocker stops printing. The file cannot continue until it is fixed.

Applies to: Interior and cover files.

Meaning

Our system could not open your file as a PDF. The file may be damaged, incomplete because an upload or download was interrupted, or a different file type (such as a Word or image file) that was renamed to end in .pdf.

Necessary actions

1. Try opening the file on your own computer, in Acrobat or a web browser. If it will not open there either, the file is damaged.
2. Export a fresh PDF from your original design file:
   • InDesign: File → Export → Adobe PDF (Print).
   • Word: File → Save As → PDF.
   • Canva: Share → Download → PDF Print. [Verify menu names before publishing.]
3. Do not rename other file types to .pdf. Always export or save them as PDF.
4. If your file is large, make sure it finished saving before you upload, and try again on a stable connection.
5. Upload the new file. Preflight will check it again automatically.

Can I proceed without fixing it?

No. This is a blocker. The file must be replaced before it can continue.

Still need help? Email our support team at filesupport@acutrack.com and include your Artwork number with the alert. We will be happy to take a look.