"UnreachableBrowserException" and "UnixUtils may not be used on Windows exception" after driver.quit while using MarionetteDriver - selenium

Question

Environment- Firefox 48.0.2 and Selenium 3.0.0-beta2 versions ,i am getting below error -
1472824777259 Marionette INFO Listening on port 61096 [Child 5848]
WARNING: pipe error: 109: file
c:/builds/moz2_slave/m-rel-w32-00000000000000000000/build/src/ipc/chromium/src/chrome/common/ipc_channel_win.cc,
line 343
[Child 4048] ###!!! ABORT: Aborting on channel error.: file
c:/builds/moz2_slave/m-rel-w32-00000000000000000000/build/src/ipc/glue/MessageChannel.cpp,
line 2046 Exception in thread "main"
org.openqa.selenium.remote.UnreachableBrowserException: Error
communicating with the remote browser. It may have died. Build info:
version: '3.0.0-beta2', revision: '2aa21c1', time: '2016-08-02
15:03:28 -0700' System info: host: 'VM7-JDB-068', ip: '10.60.88.67',
os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1',
java.version: '1.8.0_51' Driver info: driver.version: RemoteWebDriver
Capabilities [{rotatable=false, raisesAccessibilityExceptions=false,
marionette=true, appBuildId=20160823121617, version=, platform=XP,
proxy={}, command_id=1, specificationLevel=0, acceptSslCerts=false,
browserVersion=48.0.2, platformVersion=6.1,
XULappId={ec8030f7-c20a-464f-9b0e-13a3a9e97384}, browserName=Firefox,
takesScreenshot=true, takesElementScreenshot=true,
platformName=Windows_NT, device=desktop}] Session ID:
499ab4bb-406d-4252-8b5d-808b22831595 at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:670)
at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:706)
at
org.openqa.selenium.remote.RemoteWebDriver.quit(RemoteWebDriver.java:531)
at firefox_java.sample.main(sample.java:19) Caused by:
java.lang.IllegalStateException: UnixUtils may not be used on Windows
at
org.openqa.selenium.os.ProcessUtils.getProcessId(ProcessUtils.java:188)
at
org.openqa.selenium.os.UnixProcess$SeleniumWatchDog.getPID(UnixProcess.java:222)
at
org.openqa.selenium.os.UnixProcess$SeleniumWatchDog.access$300(UnixProcess.java:201)
at org.openqa.selenium.os.UnixProcess.destroy(UnixProcess.java:132)
at org.openqa.selenium.os.CommandLine.destroy(CommandLine.java:155)
at
org.openqa.selenium.remote.service.DriverService.stop(DriverService.java:196)
at
org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:94)
at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:649)
... 3 more on driver.quit();
Here is my Java code:
String marionetteDriverLocation = "\\Lib\\geckodriver.exe";
System.setProperty("webdriver.gecko.driver", marionetteDriverLocation);
WebDriver driver = new FirefoxDriver();
driver.get("https://www.google.co.in");
driver.quit();
Could you please help .
Thanks

Answer 1

Below is the working copy that I just now tried. If it doesn't work, then there should be problem with selenium jar or gecodriver.exe you are using.
public class MarrionateTest {
public static void main(String[] args) {
System.setProperty("webdriver.gecko.driver", System.getProperty("user.dir") + "/BrowserDrivers/geckodriver.exe");
DesiredCapabilities cap = DesiredCapabilities.firefox();
cap.setCapability("marionette", true);
WebDriver driver = new MarionetteDriver(cap);
driver.get("http://www.seleniumhq.org");
driver.close();
}
}

Answer 2

You have used MarionetteDriver but initializing FirefoxDriver().
Please try with WebDriver driver = new MarionetteDriver(cap); it should work.