documentation

Hi,
Is there a tutorial or Java doc I can use to see how to convert HTML to PDF using openpdftohtml.
I have a simple html -

Hello World

Below is the error I got. I used PdfRenderBuilder as shown in the example -

com.openhtmltopdf.load INFO:: SAX XMLReader in use (parser): com.sun.org.apache.xerces.internal.parsers.SAXParser
com.openhtmltopdf.load INFO:: SAX XMLReader in use (parser): com.sun.org.apache.xerces.internal.parsers.SAXParser
com.openhtmltopdf.exception WARNING:: Unhandled exception. Failed on configuring SAX to DOM transformer.
Exception in thread "main" com.openhtmltopdf.util.XRRuntimeException: Failed on configuring SAX to DOM transformer.
at com.openhtmltopdf.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:266)
at com.openhtmltopdf.resource.XMLResource$XMLResourceBuilder.access$100(XMLResource.java:168)
at com.openhtmltopdf.resource.XMLResource.load(XMLResource.java:81)
at com.openhtmltopdf.pdfboxout.PdfBoxRenderer.setDocumentFromString(PdfBoxRenderer.java:239)
at com.openhtmltopdf.pdfboxout.PdfBoxRenderer.(PdfBoxRenderer.java:168)
at com.openhtmltopdf.pdfboxout.PdfRendererBuilder.buildPdfRenderer(PdfRendererBuilder.java:51)
at com.fedex.templatemaker.util.Test.renderPDF(Test.java:54)
at com.fedex.templatemaker.util.Test.main(Test.java:45)
Caused by: java.lang.NullPointerException: SharedContext must be registered in renderer.
at com.openhtmltopdf.util.ThreadCtx$ThreadData.sharedContext(ThreadCtx.java:32)
at com.openhtmltopdf.resource.XMLResource$XMLResourceBuilder.createXMLResource(XMLResource.java:245)
... 7 more