Automatically printing PDF prints OK but throws error in Adobe Reader (TCPDF)

Hi experts,

I've been working on a web application that occasionally generates PDF printouts. For convenience the print dialog is opened automatically with a "print();" JavaScript command that's included in the PDF file. The PDF file gets generated fine, looks all right, prints straight, but for some reason the Adobe Reader (both desktop app and plugin) gives the error message "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem" after printing. Foxit Reader prints the file without displaying error messages, but shows a informational message stating "This document contains interactive form fields".

I'm using the TCPDF library, as it's the only one I found that supports attaching JS. I've attached example code - a bare minimum that generates an A4 page with a single string of text which still gives the error message after printing. An example PDF file generated by this script is also attached.

I've some experience in generating PDF files using bundled libraries, but little in the actual syntax of PDF.

<?
require_once('tcpdf.php'); // Version 4.2.001, 2008-10-30
 
class test extends TCPDF {
 
	public function __construct(){
 
		TCPDF::__construct();	
 
		// Include print dialog opening JavaScript
		$this->setUserRights(); 
	 	$this->IncludeJS("print();"); 
 
		// Create a page with some content
		$this->AddPage();
		$this->Cell(0,0,"Testing",0,1,'L');		
 
 
		// Stream file
		$this->Output("test.pdf", "I");
	}
 
	//Page header, overrides TCPDF default
    public function Header() {
    }
    
    //Page footer, overrides TCPDF default
    public function Footer() {
    }
}
$foo = new test();
?>

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test.pdf