Exception in thread "main" org.openqa.selenium.WebDriverException: unknown error: cannot get automation extension

I am trying to login page using below script but while maximize window it shows me below error.

Exception in thread "main" org.openqa.selenium.WebDriverException: unknown error: cannot get automation extension from unknown error: page could not be found: chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/_generated_background_page.html (Session info: chrome=57.0.2987.133) (Driver info: chromedriver=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9),platform=Windows NT 10.0.14393 x86_64) (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 10.11 seconds Build info: version: '3.3.1', revision: '5234b32', time: '2017-03-10 09:04:52 -0800' System info: host: 'PRASANNAMULAY', ip: '172.21.31.80', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_121' Driver info: org.openqa.selenium.chrome.ChromeDriver Capabilities [{applicationCacheEnabled=false, rotatable=false, mobileEmulationEnabled=false, networkConnectionEnabled=false, chrome={chromedriverVersion=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9), userDataDir=C:\Users\PRASAN~1\AppData\Local\Temp\scoped_dir12528_8422}, takesHeapSnapshot=true, pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true, hasTouchScreen=false, version=57.0.2987.133, platform=XP, browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true, locationContextEnabled=true, webStorageEnabled=true, browserName=chrome, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true, unexpectedAlertBehaviour=}] Session ID: 947fe656f81e3ced5cf5c932e81bc2f8 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:216) at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:638) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:661) at org.openqa.selenium.remote.RemoteWebDriver$RemoteWebDriverOptions$RemoteWindow.maximize(RemoteWebDriver.java:895) at pract_1_phase_3.Pract_1_phase_3.main(Pract_1_phase_3.java:48)

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My code is:-
package pract_1_phase_3;

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import org.openqa.selenium.interactions.Action;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Wait;

import com.google.common.base.Function;

public class Pract_1_phase_3 {

    public static void main(String[] args)throws AWTException {

    //  System.setProperty("webdriver.gecko.driver","D:\\Gecko\\geckodriver.exe");


        ChromeOptions options = new ChromeOptions();

        Map<String, Object> prefs = new HashMap<String, Object>();
        prefs.put("credentials_enable_service", false);
        prefs.put("password_manager_enabled", false); 
        options.setExperimentalOption("prefs", prefs);

        ChromeDriver driver = new ChromeDriver(options);

        driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

        driver.get("http://demo.actitime.com/");

        driver.manage().window().maximize();

        driver.findElement(By.name("username")).sendKeys("admin");

        driver.findElement(By.name("pwd")).sendKeys("manager");

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

Please tell me whats steps i need to do to resolve above issue

Thanks in advance

Upgrade to latest chromedriver.

This was a bug and was resolved in chromedriver v2.28. Refer: https://sites.google.com/a/chromium.org/chromedriver/downloads