title: getting error org.openqa.selenium.UnsupportedCommandException
body: <p>I'm running a program for Login using selenium WebDriver and getting an error. What could be the reason?</p>
  
  <pre><code>Exception in thread "main" org.openqa.selenium.UnsupportedCommandException: GIF89a
  Command duration or timeout: 156 milliseconds
  Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 16:57:40'
  System info: host: 'VRDT32', ip: '172.18.1.152', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_74'
  Driver info: org.openqa.selenium.firefox.FirefoxDriver
      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:206)
      at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
      at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:678)
      at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:249)
      at org.openqa.selenium.remote.RemoteWebDriver.&lt;init&gt;(RemoteWebDriver.java:131)
      at org.openqa.selenium.firefox.FirefoxDriver.&lt;init&gt;(FirefoxDriver.java:218)
      at org.openqa.selenium.firefox.FirefoxDriver.&lt;init&gt;(FirefoxDriver.java:211)
      at org.openqa.selenium.firefox.FirefoxDriver.&lt;init&gt;(FirefoxDriver.java:207)
      at org.openqa.selenium.firefox.FirefoxDriver.&lt;init&gt;(FirefoxDriver.java:120)
      at LoginPage.main(LoginPage.java:11)
  </code></pre>
  
  <p><strong>Edit:</strong> OP says this code was working before:</p>
  
  <pre><code>import org.openqa.selenium.By;
  import org.openqa.selenium.firefox.FirefoxDriver;
  
  public class LoginPage {
      public static void main(String[] args) { // TODO Auto-generated method stub
          FirefoxDriver driver = new FirefoxDriver();
          driver.manage().window().maximize();
  
          driver.get("http://180.211.114.147:97/Account/Login");
          driver.findElement(By.xpath("//*[@id='UserName']")).sendKeys("Chetna123");
          driver.findElement(By.xpath("//*[@id='Password']")).sendKeys("Chetna123");
          driver.findElement(By.xpath("//*[@id='btnLogin']")).click();
      }
  }
  </code></pre>