Anyone used WebPDFReports 1.0

I have  a little problem with using this Framework and would really  
appreciate a little help.

Im trying to create a PDF doc based on the contents of a component  
but run into a error

I have this code:

            PDFPage pdfPage = (PDFPage)pageWithName("PDFPage");
		HTML2PDFConvertor pdfConvertor = new HTML2PDFConvertor();
		pdfConvertor.createDocument("A4",  
HTML2PDFConvertor.PortraitOrientation);
		pdfConvertor.setTopMargin(5);	pdfConvertor.setLeftMargin(5);
		pdfConvertor.setPrintsVerticallyCentered(false);
		pdfPage.setConvertor(pdfConvertor);
         WOComponent demoPage = pageWithName("Demo");
         pdfPage.appendComponent(demoPage);


      WOResponse response = pdfPage.generateResponse();
     NSData htmlAsData = response.content();

         try{
     FileOutputStream fileToSaveAs = new FileOutputStream((String) 
System.getProperties().getProperty("pathToServer")+"0000004.pdf");
     htmlAsData.writeToStream(fileToSaveAs);



               }catch(FileNotFoundException e){

         e.printStackTrace();
         }catch(IOException io){
         io.printStackTrace();
         }


And I get this error with the debugger launching -

java[1100] *** Uncaught exception: <NSInvalidArgumentException> *** - 
[NSPlaceholderString initWithString:]: nil argument

Anyone point me in the right direction

GIno