Hi I am trying to read XPath queries from a file and run it against a xml data file. I am doing it through Saxon Xpath processor. But i keep getting this error. Code i am using is from sample code provided with the library.

Error i am getting is :

Exception in thread "main" javax.xml.xpath.XPathExpressionException: Supplied node must be built using the same or a compatible Configuration
    at net.sf.saxon.xpath.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:283)
    at net.sf.saxon.xpath.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:375)
    at edu.xml.XPathExample.go(XPathExample.java:81)
    at edu.xml.XPathExample.main(XPathExample.java:42)

-

 public void go(String filename) throws Exception {

    XPathExpression findLine = null;
    String readLine = null;
    Object document = new XPathEvaluator().setSource(new StreamSource(new File(dataPath)));

    System.setProperty("javax.xml.xpath.XPathFactory:" + NamespaceConstant.OBJECT_MODEL_SAXON,
            "net.sf.saxon.xpath.XPathFactoryImpl");

    XPathFactory xpf = XPathFactory.newInstance(NamespaceConstant.OBJECT_MODEL_SAXON);
    XPath xpe = xpf.newXPath();

    if (filename != null) {
        this.queryPath = filename;
    }

    try {
        fileReader = new BufferedReader(new FileReader(queryPath));
    } catch (FileNotFoundException ex) {
        System.out.println("File not found: " + ex.getMessage());
    }
    xpe.setXPathVariableResolver(this);

    while (true) {
        try {
            readLine = fileReader.readLine();
        } catch (IOException ex) {
            System.out.println("Error while reading file: " + ex.getMessage());
        }
        if (readLine == null) {
            break;
        }
        findLine = xpe.compile(readLine);
        String resultString = findLine.evaluate(document);

        System.out.println("<output>");
        System.out.println("String Value => " + resultString);
        System.out.println("</output>");
    }
}