Getting issue Exception in thread "main" org.openqa.selenium.WebDriverException: Unknown command. Options: ActivateTab, CloseTab, DeleteCookie, ExecuteJavascript, GetCookies, GetIndicesFromTab, GetTabIds, GetTabTitle, GetTabURL, GoBack, GoForward, IsTabIdValid, NavigateToURL, Reload, SendWebkitKeyEvent, SetCookie, WaitForAllTabsToStopLoading, WebkitMouseClick, WebkitMouseDrag, WebkitMouseMove, AddHistoryItem, AddOrEditSearchEngine, AddSavedPassword, AwaitSyncCycleCompletion, ClearBrowsingData, CloseNotification, DisablePlugin, DisableSyncForDatatypes, EnablePlugin, EnableSyncForDatatypes, FillAutoFillProfile, FindInPage, GetActiveNotifications, GetAutoFillProfile, GetBlockedPopupsInfo, GetBrowserInfo, GetDownloadsInfo, GetExtensionsInfo, GetHistoryInfo, GetInitialLoadTimes, GetInstantInfo, GetNTPInfo, GetNTPMenuMode, GetNTPThumbnailMode, GetNavigationInfo, GetOmniboxInfo, GetPluginsInfo, GetPrefsInfo, GetSavedPasswords, GetSearchEngineInfo, GetSyncInfo, GetThemeInfo, GetTranslateInfo, ImportSettings, KillRendererProcess, LoadSearchEngineInfo, MoveNTPMostVisitedThumbnail, OmniboxAcceptInput, OmniboxMovePopupSelection, PerformActionOnDownload, PerformActionOnInfobar, PerformActionOnSearchEngine, RemoveNTPMostVisitedThumbnail, RemoveSavedPassword, RestoreAllNTPMostVisitedThumbnails, SaveTabContents, SelectTranslateOption, SetNTPMenuMode, SetNTPThumbnailMode, SetOmniboxText, SetPrefs, SetWindowDimensions, SignInToSync, UnblockAndLaunchBlockedPopup, UninstallExtensionById, UnpinNTPMostVisitedThumbnail, WaitForAllDownloadsToComplete, WaitForNotificationCount,  (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 2.45 seconds Build info: version: '2.31.0', revision: '1bd294d', time: '2013-02-27 20:53:56' System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.6.0_35' Driver info: org.openqa.selenium.chrome.ChromeDriver 	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:187) 	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.startSession(RemoteWebDriver.java:216) 	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:111) 	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:115) 	at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:161) 	at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:107) 	at Firstclass.main(Firstclass.java:13)