title: Selenium - org.openqa.selenium.WebDriverException: f.QueryInterface is not a function
body: <pre><code>@Test
  public void myDriver() throws IOException, InterruptedException {
  
  
      FirefoxDriver myD = new FirefoxDriver();
      String vkw, vxpath, vtestdata;
      long iWait = 1000000000;
  
      String[][] xTC, xTS;
  
      xTC = readxl("C:\\Selenium\\KDF.xls", "Test case");
      xTS = readxl("C:\\Selenium\\KDF.xls", "Test steps");
      for (int i = 1; i &lt; xTC.length; i++) {
          if (xTC[i][3].equalsIgnoreCase("Y")) {
              System.out.println("Yes");
              for (int k = 1; k &lt; xTS.length; k++) {
                  if (xTC[i][0].equalsIgnoreCase(xTS[k][1])) {
                      vkw = xTS[k][4];
                      vxpath = xTS[k][5];
                      vtestdata = xTS[k][5];
  
                          /*  if (vkw.equalsIgnoreCase("enter text")){
                                  Fentertext(myD, vxpath, vtestdata);
                              }
                              */
                      if (vkw.equalsIgnoreCase("navigate browser")) {
                          FnavigateBrowser(myD, vtestdata);
                      }
  
                      Thread.sleep(iWait);
  
                  }
              }
          }
      }
  }
  </code></pre>
  
  <hr>
  
  <pre><code>Error:- org.openqa.selenium.WebDriverException: f.QueryInterface is
  not a function Command duration or timeout: 144 milliseconds Build
  info: version: '2.39.0', revision: 'ff23eac', time: '2013-12-16
  16:12:12' System info: host: 'del1-dhp-28988', ip: '172.16.45.14',
  os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1',
  java.version: '1.7.0_09' Session ID:
  043a4dc7-520f-44a5-a74c-c6cb274d50b9 Driver info:
  org.openqa.selenium.firefox.FirefoxDriver Capabilities [{platform=XP,
  acceptSslCerts=true, javascriptEnabled=true, cssSelectorsEnabled=true,
  databaseEnabled=true, browserName=firefox, handlesAlerts=true,
  browserConnectionEnabled=true, webStorageEnabled=true,
  nativeEvents=true, rotatable=false, locationContextEnabled=true,
  applicationCacheEnabled=true, takesScreenshot=true, version=26.0}]  
      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:193)
      at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
      at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:554)
      at org.openqa.selenium.remote.RemoteWebDriver.get(RemoteWebDriver.java:276)
      at org.openqa.selenium.remote.RemoteWebDriver$RemoteNavigation.to(RemoteWebDriver.java:800)
      at KDF3.FnavigateBrowser(KDF3.java:185)
      at KDF3.myDriver(KDF3.java:50)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)  
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  
      at java.lang.reflect.Method.invoke(Unknown Source)  
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)  
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)  
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)    
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)  
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)     
      at org.junit.runners.ParentRunner.run(ParentRunner.java:236)    
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  Caused by:
  org.openqa.selenium.remote.ErrorHandler$UnknownServerException:
  f.QueryInterface is not a function Build info: version: '2.39.0',
  revision: 'ff23eac', time: '2013-12-16 16:12:12' System info: host:
  'del1-dhp-28988', ip: '172.16.45.14', os.name: 'Windows 7', os.arch:
  'amd64', os.version: '6.1', java.version: '1.7.0_09' Driver info:
  driver.version: unknown     
      at &lt;anonymous class&gt;.FirefoxDriver.prototype.get(file:///C:/Users/POORVA~1.SHA/AppData/Local/Temp/anonymous8563012586736156603webdriver-profile/extensions/fxdriver@googlecode.com/components/driver_component.js:8720)
      at &lt;anonymous class&gt;.DelayedCommand.prototype.executeInternal_/h(file:///C:/Users/POORVA~1.SHA/AppData/Local/Temp/anonymous8563012586736156603webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10831)
      at &lt;anonymous class&gt;.DelayedCommand.prototype.executeInternal_(file:///C:/Users/POORVA~1.SHA/AppData/Local/Temp/anonymous8563012586736156603webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10836)
      at &lt;anonymous class&gt;.DelayedCommand.prototype.execute/&lt;(file:///C:/Users/POORVA~1.SHA/AppData/Local/Temp/anonymous8563012586736156603webdriver-profile/extensions/fxdriver@googlecode.com/components/command_processor.js:10778)
  </code></pre>