org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server

My selenium code does not run. Keeps throwing me the following error:

Exception in thread "main" org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.
Build info: version: 'unknown', revision: 'unknown', time: 'unknown'
System info: host: 'SLAP129', ip: '192.168.4.218', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_74'
Driver info: driver.version: FirefoxDriver
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:658)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:250)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:236)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:137)
    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:191)
    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:108)
    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:104)
    at PractiseSession1.OpenBrowser(PractiseSession1.java:35)
    at PractiseSession1.main(PractiseSession1.java:16)
Caused by: java.lang.NullPointerException
    at org.openqa.selenium.remote.service.DriverService.waitUntilAvailable(DriverService.java:192)
    at org.openqa.selenium.firefox.XpiDriverService.start(XpiDriverService.java:94)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:78)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:637)
    ... 8 more

FIREFOX VERSION: 53.0.3 (32 Bit) SELENIUM VERSION: selenium-java-3.4.0 I am using Eclipse Luna and my machine is Windows 7 (64 bit). I have read all the the help queries but could not find solution. Here is my Java code:

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
public class PractiseSession1 
{
public static void main(String[] args)

{
    // TODO Auto-generated method stub
    WebDriver driver = null;
    String URL="http://www.google.com";
    //System.out.println("Application title is =============");
    PractiseSession1 ade= new PractiseSession1();
    ade.OpenBrowser(driver);
    ade.GetPage(URL, driver);
    ade.quitbrowser(driver);
}

private void quitbrowser(WebDriver driver)
{
    driver.quit();
}
private void GetPage(String URL, WebDriver driver)
{
    driver.get(URL);
    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
}
private void OpenBrowser(WebDriver driver)
{
    System.setProperty("webdriver.firefox.marionette", "<Geckodriver 
    path>geckodriver.exe");
    DesiredCapabilities capabilities = DesiredCapabilities.firefox();
    capabilities.setCapability("marionette", true);
    driver= new FirefoxDriver();
    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
}
}