I must create my thesis in pdf/a format. I'm using the package pdfx calling in the preamble:


When I open the pdf with Adobe I got the blu bar says me that file is in PDF/A format. Unfortunately when I validate the file using always Adobe I got many strange error. I don't know how to resolve the problem.

here it is the file:




\usepackage{setspace} %setta l'interlinea a 1,5


\Author{Salvatore Mazzarino}
\Keywords{Mobile Cloud\sep
Green Networking\sep
Network Coding\sep
User Cooperation\sep
\Org{Università degli Studi di Catania} 




Here it is the errors I got:

enter image description here

Validating file "prova.pdf" for conformance level pdfa-1b
The separator after an 'obj' must be an EOL. (2)
The separator before an 'endobj' must be an EOL. (2)
The separator before 'endstream' must be an EOL.
XML line 21:27: Input is not proper UTF-
Bytes: 0xE0 0x20 0x64 0x65.", 1
The value of the key N is 4 but must be 3.
The document does not conform to the requested standard.
The file format (header, trailer, objects, xref, streams) is corrupted.
The document doesn't conform to the PDF reference (missing required entries, wrong value types, etc.).
The document's meta data is either missing or inconsistent or corrupt.

enter image description here

  • Well I resolved the last two problems. It was an png file...the other problem I don't know how to resolve it...
    – Mazzy
    Commented Dec 22, 2012 at 10:48
  • valitade it with a pdf/a online validator I got the errors above
    – Mazzy
    Commented Dec 22, 2012 at 14:29
  • 2
    @HarishKumar please try to validate it online with this validator:pdf-tools.com/pdf/validate-pdfa-online.aspx
    – Mazzy
    Commented Dec 22, 2012 at 14:41
  • The UTF problem is surely caused by an encoding problem: 0xE0 0x20 0x64 0x65 is the string à de in Latin-1 encoding and seems to come from Università degli Studi. Ensure that the .xmpdata file is UTF-8.
    – egreg
    Commented Dec 22, 2012 at 15:41
  • 1
    I know this problem and how to solve it. It is a general problem of Acrobat's preflight with PDFs generated by pdftex.
    – user26372
    Commented Feb 25, 2013 at 10:22


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