Error in Digital signature

Hi all :) 

I'm using itext 5.5.6 to sign a PDF document, using the:
 *Code sample 4.1: Signing a document using PKCS#11* 
of the book: /Digital Signatures for PDF documents/

But I have the following error when validating adobe reader: 

<http://itext.2136553.n4.nabble.com/file/n4660846/Adobe_Reader.png> 

I have not found the solution to the error, 

attached the document signed:  firmado.pdf
<https://storage.dataokey.com:5001/fbsharing/ZUyUMrem>  

I appreciate your comments, 
Regards.



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