Take a screenshot of Selenium WebDriver

Screenshot.java

// This method takes a screenshot of the browser and saves as a file
public static void snap(WebDriver driver, String filename) {
	String rootFolder = "C:/Users/SeleniumProjects/TestOutput/";
	File ScreenshotFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE); // Create file from the screenshot of driver
	try {
		FileUtils.copyFile(ScreenshotFile, new File (rootFolder + filename + ".jpg"));
	} catch (IOException e) {
		System.out.println("Could not save the file");
		e.printStackTrace();
	}
}

getting error msg
The method copyFile(File, File) is undefined for the type FileUtils