Drag and drop is not working, please some buddy help me.

```
driver.get("http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_draganddrop");

    Actions builder = new Actions(driver);
    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
    driver.switchTo().frame(driver.findElement(By.className("result_output")));
    System.out.println(driver.findElement(By.tagName("body")).getText());
    Action dropImage = builder.dragAndDrop(driver.findElement(By.id("drag1")), driver.findElement(By.id("div1"))).build();
    dropImage.perform();

```