WeDriver FirefoxDriver cannot be used after quit() was called

i am having issues in acquiring correct driver instance. following is my setup

public class SeleniumBase{
    public static WebDriver  driver;
      public static void setUp(url,browser,port){
        driver = new FirefoxDriver();
      }
      public static void tearDown(){      
        driver.manage().deleteAllCookies();
        driver.close();
        driver.quit();         
      }
    }

public class BuildTest extends SeleniumBase{

    @BeforeClass
        public static void seleniumSetup(){
        try{
            // read properties
            url = prop.getProp("baseUrl");
            browser = prop.getProp("browser");
            port = prop.getProp("port");
            }
            SeleniumBase.setUp(url,browser,port);
            waitForLoginPage();
            App.login();
        }
    @AfterClass
        public static void seleniumTearDown(){
            App.logOut();
            SeleniumBase.tearDown();
        }
}

@RunWith(Suite.class)
    @Suite.SuiteClasses(
            {                                               
                Test1.class,
                Test2.class
            })

public class SmokeSuite {


}

now, for Test1.class everything works fine but when Test2.class is invoked from the suite, new driver instance is created with the setUp method, but App.Login() throws error saying "The FirefoxDriver cannot be used after quit() was called"

is anything going wrong in my setup/teardown..?