Tabletools buttons PDF not working

jvcunha

The CVS, XLS and print work. Only PDF does not work.
By clicking on PDF, lock everything and gives error in shockwave.
                 aButtons: [
                     {
                         sExtends: "xls"
                         sButtonText: "Excel"
                         sFileName: "* .xls"
                         sToolTip: "Save data in Excel spreadsheet"
                     },
                     {
                         sExtends: "pdf"
                         sButtonText: "PDF"
                         sFileName: "* .pdf"
                         sToolTip: "Save data in PDF"
                     }
                 ]