HtmlUnit com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error

 List <HtmlElement> ips = null ;
 List <HtmlElement> ports = null ; 
 ArrayList <String> proxies = new ArrayList();
 HtmlPage page = null;
 String baseUrl = "http://www.freeproxylists.net/" ;
 WebClient client;

 try{
 client = new WebClient();
 client.getOptions().setJavaScriptEnabled(false);
 page = client.getPage(baseUrl);
 ips = page.getByXPath("//table[@class='DataGrid']/tbody/tr/td[position()=1]/text()");
 ports = page.getByXPath("//table[@class='DataGrid']/tbody/tr/td[position()=2]/text()");

 for(int i=0;i<ips.size();i++){
 proxies.add(ips.get(i)+":"+ports.get(i));
 System.out.println(ips.get(i)+":"+ports.get(i));
 }


 }
 catch(Exception e){
 System.out.println(e);
 }

sorry for my bad code indenting, anyway i'm trying to scrape proxy from the site and i got these warning:

mag 20, 2018 4:04:56 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error AVVERTENZA: CSS error: 'http://www.freeproxylists.net/grid.css' [1:1] Error in rule. (Invalid token "<". Was expecting one of: , , "", ".", ":", "", "[", , , , , , , .) mag 20, 2018 4:04:56 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning AVVERTENZA: CSS warning: 'http://www.freeproxylists.net/grid.css' [1:1] Ignoring the whole rule. mag 20, 2018 4:04:56 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error AVVERTENZA: CSS error: 'http://www.freeproxylists.net/grid.css' [45:1] Error in rule. (Invalid token "<". Was expecting one of: , , "", ".", ":", "", "[", , , , , , .) mag 20, 2018 4:04:56 PM com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning AVVERTENZA: CSS warning: 'http://www.freeproxylists.net/grid.css' [45:1] Ignoring the whole rule.

How can i fix this?