Exception : The reference to entity "etag" must end with the ';' delimiter.

My code looks like below

Please provide me solution

HttpGet query = new HttpGet(catalogURI);
        query.addHeader("Accept", "application/xml");
        query.addHeader("OSLC-Core-Version", "2.0");

        // Access to the Service Providers catalog
        HttpResponse response = HttpUtils.sendGetForSecureDocument(server,
                query, login, password, httpclient, JTS_Server);
        if (response.getStatusLine().getStatusCode() != 200) {
            response.getEntity().consumeContent();
            throw new HttpResponseException(response.getStatusLine()
                    .getStatusCode(), response.getStatusLine()
                    .getReasonPhrase());
        }
        // Define the XPath evaluation environment
        XPath xpath = getXpathNamespace();
        String serviceProviderXPath = "//oslc:ServiceProvider[dcterms:title=\""
                + paName + "\"]/@rdf:about";
        

        // Retrieve the designated Service Provider
        InputSource source = new InputSource(response.getEntity().getContent());
        Node paNode = (Node) (xpath.evaluate(serviceProviderXPath, source,XPathConstants.NODE));

OSLC Output in Rest (FireFox)
<oslc:serviceProvider> </oslc:serviceProvider>

Exception:
Fatal Error] :17:78: The reference to entity "etag" must end with the ';' delimiter.
org.xml.sax.SAXParseException; lineNumber: 17; columnNumber: 78; The reference to entity "etag" must end with the ';' delimiter.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(Unknown Source)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.getServiceProvider(QueryingRequirements.java:180)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.run(QueryingRequirements.java:90)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.main(QueryingRequirements.java:81)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException: org.xml.sax.SAXParseException; lineNumber: 17; columnNumber: 78; The reference to entity "etag" must end with the ';' delimiter.
    at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(Unknown Source)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.getServiceProvider(QueryingRequirements.java:180)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.run(QueryingRequirements.java:90)
    at com.bosch.dngintegration.cscrm.QueryingRequirements.main(QueryingRequirements.java:81)
Caused by: org.xml.sax.SAXParseException; lineNumber: 17; columnNumber: 78; The reference to entity "etag" must end with the ';' delimiter.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    ... 4 more