java - Automated testing using selenium with firefox browser -

i downloaded code below , used tests , u=it ran yesterday since today code stopped working. tests failing not happening before. throws error saying org.openqa.selenium.elementnotvisibleexception: element not visible cannot interact element.

package org.openqa.selenium.example;  //import org.openqa.selenium.browserlaunchers.locators.googlechromelocator;  //import java.util.regex.pattern; import java.util.concurrent.timeunit;  import org.junit.*;  import static org.junit.assert.*;  //import org.openqa.selenium.*; import org.openqa.selenium.by; import org.openqa.selenium.webdriver; import org.openqa.selenium.webelement; //import org.openqa.selenium.chrome.*; import org.openqa.selenium.firefox.*; import org.openqa.selenium.firefox.firefoxdriver; //import org.openqa.selenium.support.ui.select; //import org.openqa.selenium.net.urlchecker;  import static org.junit.assert.assertequals;   import org.junit.test;  public class kongaurltest  {        private webdriver driver;       private string baseurl;       //private boolean acceptnextalert = true;       private stringbuffer verificationerrors = new stringbuffer();        @before       public void setup() throws exception        {         driver = new firefoxdriver();         baseurl = "http://www.konga.com/";         driver.manage().timeouts().implicitlywait(30, timeunit.seconds);       }        @test       public void testfirefoxwebdriver() throws exception        {         driver.get(baseurl);         driver.findelement(by.cssselector("a.vertnavlink > span")).click();         try          {           assertequals("phones & tablets | konga nigeria", driver.gettitle());           system.out.println(driver.gettitle());         }          catch (error e)          {           verificationerrors.append(e.tostring());         }       }        @after       public void teardown() throws exception        {         system.out.println(driver.getcurrenturl());         driver.quit();        }    } 

there's blocking dialog being displayed. it's displayed each time selenium opens new browser , navigates site. close dialog first:

driver.get(baseurl); try {     driver.findelement(by.cssselector(".fancybox-close")).click(); } catch { } driver.findelement(by.cssselector("a.vertnavlink > span")).click();