Problema Validação XML

try {
      SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
      Schema schema = schemaFactory.newSchema(new File("leiauteNFe_v2.00.xsd"));
      
      Validator validator = schema.newValidator();      
      
      DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
      FileInputStream input = new FileInputStream("NFe25100409268517007143551010000016971313866003.xml");
      Document doc = db.parse(input);
      input.close();
      
      validator.validate(new DOMSource(doc));
} catch (IOException e) {
      System.out.println(IOException.class.getName() + ": " + e.getMessage());
} catch (SAXException e) {
      System.out.println(SAXException.class.getName() + ": " + e.getMessage());
} catch (ParserConfigurationException e) {
      System.out.println(ParserConfigurationException.class.getName() + ": " + e.getMessage());
}

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