title: "cannot focus element" exception while trying to upload an attachment using selenium
body: <p>While trying to upload an attachment, trying to send the keys instead of opening the OS based file explorer window as sending the path to the file would be easy. </p>
  
  <p>Tried with different element identifiers, still not able to send the keys. mentioned the element HTML below.</p>
  
  <p>Attached the image of element.
  <a href="https://i.stack.imgur.com/1BYfi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1BYfi.png" alt="enter image description here"></a></p>
  
  <p>Tried Below Xpath,</p>
  
  <pre><code>//*[@id='fileListVideo']//*[starts-with(@class,'qq-upload-button')]
  </code></pre>
  
  <p>Error Log:</p>
  
  <pre><code>org.openqa.selenium.WebDriverException: unknown error: cannot focus element
    (Session info: chrome=66.0.3359.181)
    (Driver info: chromedriver=2.39.562713 (dd642283e958a93ebf6891600db055f1f1b4f3b2),platform=Mac OS X 10.13.4 x86_64) (WARNING: The server did not provide any stacktrace information)
  Command duration or timeout: 0 milliseconds
  Build info: version: '3.12.0', revision: '7c6e0b3', time: '2018-05-08T14:04:26.12Z'
  System info: host: 'nagarjunaMBP.local', ip: 'fe80:0:0:0:c2e:b816:67ae:922b%en0', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.13.4', java.version: '1.8.0_60'
  Driver info: org.openqa.selenium.chrome.ChromeDriver
  Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 2.39.562713 (dd642283e958a9..., userDataDir: /var/folders/g4/dylg4g7s7wb...}, cssSelectorsEnabled: true, databaseEnabled: false, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: MAC, platformName: MAC, rotatable: false, setWindowRect: true, takesHeapSnapshot: true, takesScreenshot: true, unexpectedAlertBehaviour: , unhandledPromptBehavior: , version: 66.0.3359.181, webStorageEnabled: true}
  Session ID: 38b991ebd4acf37fd0aefaef902853f9
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
      at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
      at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
      at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:214)
      at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:166)
      at org.openqa.selenium.remote.http.JsonHttpResponseCodec.reconstructValue(JsonHttpResponseCodec.java:40)
      at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:80)
      at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:44)
      at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
      at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
      at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:543)
      at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:276)
      at org.openqa.selenium.remote.RemoteWebElement.sendKeys(RemoteWebElement.java:100)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:51)
      at com.sun.proxy.$Proxy17.sendKeys(Unknown Source)
      at actions.PublishBroadcast.MediaLibAction.uploadVideos(MediaLibAction.java:76)
      at stepDefinitions.Publish.SDMediaLibrary.Upload_an_Image(SDMediaLibrary.java:43)
      at ✽.When Upload an Image(features/publish/mediaLibrary/MediaLibrary.feature:10)
  </code></pre>