title: Gecko driver issue
body: <p>am unable to open browser using geckodriver 3.8.1 and selenium oxygen  and firefox 57.0.4(32 bit) version</p>
  
  <pre><code>package Selenium_JavaFundamentals;
  
  import org.openqa.selenium.WebDriver;
  import org.openqa.selenium.firefox.FirefoxDriver;
  
  public class opengmail {
  
      public static void main(String[] args) {
          // TODO Auto-generated method stub
          WebDriver driver = new FirefoxDriver();
  
          driver.get("https://www.google.com");
      }
  }
  </code></pre>
  
  <p>I am getting following error:</p>
  
  <blockquote>
    <p>Exception in thread "main" java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.gecko.driver system property; for more information, see <a href="https://github.com/mozilla/geckodriver" rel="nofollow noreferrer">https://github.com/mozilla/geckodriver</a>. The latest version can be downloaded from <a href="https://github.com/mozilla/geckodriver/releases" rel="nofollow noreferrer">https://github.com/mozilla/geckodriver/releases</a>
        at com.google.common.base.Preconditions.checkState(Preconditions.java:754)
        at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:124)
        at org.openqa.selenium.firefox.GeckoDriverService.access$100(GeckoDriverService.java:41)
        at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:141)
        at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:339)
        at org.openqa.selenium.firefox.FirefoxDriver.toExecutor(FirefoxDriver.java:158)
        at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:120)
        at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:98)
        at Selenium_JavaFundamentals.opengmail.main(opengmail.java:10)</p>
  </blockquote>
  
  <p>Please note that I have loaded the gecko driver.</p>