la source de l'attachement ne contient pas de source pour le fichier Throwables.class

Je suis en train d'exécuter le code suivant dans Eclipse, mais obtenir cette exception:

Pièce Jointe Source ne contient pas de source pour le fichier Throwables.class.

J'ai essayé de changer le chemin d'accès de l'jar requis, mais ne fonctionne pas.

    package automationFramework;

    import java.util.concurrent.TimeUnit;

    import org.openqa.selenium.*;

    import org.openqa.selenium.firefox.FirefoxDriver;

public class FirstTestCase {
private static WebDriver driver = null;
public static void main(String[] args) {
    //TODO Auto-generated method stub
    //Create a new instance of the Firefox driver

    driver = new FirefoxDriver();

    //Put a Implicit wait, this means that any search for elements on the page could take the time the implicit wait is set for before throwing exception

    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

    //Launch the Online Store Website

    driver.get("http://www.store.demoqa.com");

    //Find the element that's ID attribute is 'account'(My Account)

    driver.findElement(By.xpath(".//*[@id='account']/a")).click();

    //Find the element that's ID attribute is 'log' (Username)

    //Enter Username on the element found by above desc.

    driver.findElement(By.id("log")).sendKeys("testuser_1");

    //Find the element that's ID attribute is 'pwd' (Password)

    //Enter Password on the element found by the above desc.

    driver.findElement(By.id("pwd")).sendKeys("Test@123");

    //Now submit the form. WebDriver will find the form for us from the element

    driver.findElement(By.id("login")).click();

    //Print a Log In message to the screen

    System.out.println(" Login Successfully, now it is the time to Log Off buddy.");

    //Find the element that's ID attribute is 'account_logout' (Log Out)

    driver.findElement (By.xpath(".//*[@id='account_logout']/a")).click();

    //Close the driver

    driver.quit();

        }

}