无法在Eclipse中运行TestNG程序

Question

import org.testng.annotations.Test;    
public class logintest
{
    @Test   
    public void loginT() 
    {   
        System.out.println("Hi Chandra Shekar");
    }
}

我在Eclipse（Helios）中安装了TestNG，可以在Windows / Show View / Others / Java中看到TestNG。 在运行时我遇到以下错误..请帮忙...

An internal error occurred during: "Launching logintest".
org.osgi.framework.Version.compareTo(Lorg/osgi/framework/Version;)I