PDF export of reports/work/work synthesis per activity

Hi,

It seems that when there are lots of data to export, this PDF export does not work correctly concerning "work synthesis per activity".

Only a ".php" file empty is created.

Thanks in advance for your help.

My error log
2013-02-08 10:45:44 ***** ERROR ***** on file 'C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php' at line (1251)
2013-02-08 10:45:44 ***** ERROR ***** cause = ERROR n°1 : The tag <BUTTON> does not yet exist.If you want to add it, you must create the methods o_BUTTON (for opening) and c_BUTTON (for closure) by following the model of existing tags.If you create these methods, do not hesitate to send me an email to Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser. to included them in the next version of HTML2PDF.
2013-02-08 10:45:44 ***** ERROR ***** => #0 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (1226) -> _executeAction()
2013-02-08 10:45:44 ***** ERROR ***** => #1 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (5446) -> _makeHTMLcode()
2013-02-08 10:45:44 ***** ERROR ***** => #2 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (1255) -> _tag_open_TD()
2013-02-08 10:45:44 ***** ERROR ***** => #3 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (1212) -> _executeAction()
2013-02-08 10:45:44 ***** ERROR ***** => #4 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (5446) -> _makeHTMLcode()
2013-02-08 10:45:44 ***** ERROR ***** => #5 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (1255) -> _tag_open_TD()
2013-02-08 10:45:44 ***** ERROR ***** => #6 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (1212) -> _executeAction()
2013-02-08 10:45:44 ***** ERROR ***** => #7 C:\c:\wamp\projectorria\external\html2pdf\html2pdf.class.php (408) -> _makeHTMLcode()
2013-02-08 10:45:44 ***** ERROR ***** => #8 C:\c:\wamp\projectorria\view\print.php (136) -> writeHTML()
2013-02-08 10:45:44 ***** ERROR ***** => #9 C:\c:\wamp\projectorria\view\print.php (120) -> finalizePrint()
Thanks