java - exception during convert html to pdf using itext -

i trying convert html pdf file in java using itext.i using eclipse editor,i have add 2 jar file

     xmlworker-5.4.3.jar,       itextpdf-5.1.0.jar 

in classpath.my code given beloow

        document document = new document();         pdfwriter writer = pdfwriter.getinstance(document, new          fileoutputstream("pdf.pdf"));         document.open();         xmlworkerhelper.getinstance().parsexhtml(writer, document,new           fileinputstream("index.html"));         system.out.println( "pdf created!" ); 

when run above code gives me exception. don't know how solve it. exception given below

        exception in thread "main" java.lang.nosuchmethoderror:           com.itextpdf.text.log.loggerfactory.getlogger(ljava/lang/class;)lcom/itextpdf         /text/log/loger;         @ com.itextpdf.tool.xml.net.fileretrieveimpl.<clinit>            (fileretrieveimpl.java:67)at com.itextpdf.tool.xml.css.styleattrcssresolver.            <init>         (styleattrcssresolver.java:113)         @ com.itextpdf.tool.xml.css.styleattrcssresolver.<init>            (styleattrcssresolver.java:102)          @ com.itextpdf.tool.xml.css.styleattrcssresolver.<init>          (styleattrcssresolver.java:90)         @ om.itextpdf.tool.xml.xmlworkerhelper.parsexhtml(xmlworkerhelper.java:213)         @ df.tool.xml.xmlworkerhelper.parsexhtml(xmlworkerhelper.java:185)         @ com.ps.app.main(app.java:47) 

i think error @ place

   xmlworkerhelper.getinstance().parsexhtml(writer, document,new           fileinputstream("index.html")); 

help me hove solve exception..... in advance.

it seems versions of these jars not compatible each other. try below versions , let know xmlworker-5.4.5.jar, itextpdf-5.4.5.jar