Selenium Functionality

having issue while logout the application, but the logout is not working . Please help me.

I have tried all locators. Here is the code

They are using button type.

issue : org.openqa.selenium.NoSuchElementException: no such element: Unable to locate element: {"method":"xpath","selector":"/html/body/div[2]/div/nav/div/a"} (Session info: chrome=74.0.3729.108) (Driver info: chromedriver=74.0.3729.6 (255758eccf3d244491b8a1317aa76e1ce10d57e9-refs/branch-heads/3729@{#29}),platform=Linux 3.19.0-25-generic x86_64) (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 0 milliseconds For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/no_such_element.html Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53' System info: host: 'triesten-desktop', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.19.0-25-generic', java.version: '1.8.0_211' Driver info: org.openqa.selenium.chrome.ChromeDriver Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 74.0.3729.6 (255758eccf3d24..., userDataDir: /tmp/.com.google.Chrome.dZboEb}, cssSelectorsEnabled: true, databaseEnabled: false, goog:chromeOptions: {debuggerAddress: localhost:53595}, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: LINUX, platformName: LINUX, proxy: Proxy(), rotatable: false, setWindowRect: true, strictFileInteractability: false, takesHeapSnapshot: true, takesScreenshot: true, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unexpectedAlertBehaviour: ignore, unhandledPromptBehavior: ignore, version: 74.0.3729.108, webStorageEnabled: true} Session ID: 7b4dfc928269d68b3603df556fa212bd *** Element info: {Using=xpath, value=/html/body/div[2]/div/nav/div/a} 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:423) 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:552) at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:323) at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:428) at org.openqa.selenium.By$ByXPath.findElement(By.java:353) at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:315) at test1.AutomationTest.f(AutomationTest.java:29) 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:498) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86) at org.testng.internal.Invoker.invokeMethod(Invoker.java:645) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:822) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1130) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112) at org.testng.TestRunner.privateRun(TestRunner.java:782) at org.testng.TestRunner.run(TestRunner.java:632) at org.testng.SuiteRunner.runTest(SuiteRunner.java:366) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319) at org.testng.SuiteRunner.run(SuiteRunner.java:268) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244) at org.testng.TestNG.runSuitesLocally(TestNG.java:1169) at org.testng.TestNG.run(TestNG.java:1064) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:113) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:206) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:177)