org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element

Hello,

I'm pretty new in Java.
I validate my xml againt xsd file, but this error org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element occurred.

Code :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	        factory.setValidating(true);
	        factory.setNamespaceAware(true);
	        factory.setAttribute(SCHEMA_LANGUAGE_ATTRIBUTE, XSD_SCHEMA_LANGUAGE);
	        factory.setIgnoringComments(true);
	        DocumentBuilder builder = factory.newDocumentBuilder();
	        builder.setEntityResolver(new EntityResolver() {
	            public InputSource resolveEntity(String publicId, String systemId){
	            	return new InputSource(xsd);
	            }
	        });
 
	        builder.setErrorHandler(new ErrorHandler() {
	            public void error(SAXParseException exception) throws SAXException {
	               exception.printStackTrace();
	            }
	            public void fatalError(SAXParseException exception)
	                    throws SAXException {
	            	exception.printStackTrace();
	            }
	            public void warning(SAXParseException exception)
	                    throws SAXException {
	            	exception.printStackTrace();
	            }
	        });
 
	        builder.parse(xml);