WARNING: Process refused to die after 10 seconds, and couldn't taskkill it
java.lang.NullPointerException: Unable to find executable for: taskkill
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:251)
at org.openqa.selenium.os.UnixProcess.<init>(UnixProcess.java:62)
at org.openqa.selenium.os.CommandLine.<init>(CommandLine.java:38)
at org.openqa.selenium.os.WindowsUtils.killPID(WindowsUtils.java:178)
at org.openqa.selenium.os.ProcessUtils.killWinProcess(ProcessUtils.java:138)
at org.openqa.selenium.remote.service.DriverService.stop(DriverService.java:196)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:94)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:644)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:701)
at org.openqa.selenium.remote.RemoteWebDriver.quit(RemoteWebDriver.java:526)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:134)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:144)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:170)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:159)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:116)
at Testing.java.DemoTesting.main(DemoTesting.java:12)
Exception in thread "main" org.openqa.selenium.SessionNotCreatedException: session not created exception
from unknown error: Runtime.executionContextCreated has invalid 'context': {"auxData":{"frameId":"2500.1","isDefault":true},"id":1,"name":"","origin":"://"}
(Session info: chrome=54.0.2840.87)
(Driver info: chromedriver=2.23.409699 (49b0fa931cda1caad0ae15b7d1b68004acd05129),platform=Windows NT 6.2.9200 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 2.21 seconds
Build info: version: '2.53.1', revision: 'a36b8b1', time: '2016-06-30 17:32:46'
System info: host: 'USER', ip: '192.168.0.118',
os.name: 'Windows 8', os.arch: 'amd64', os.version: '6.2', java.version: '1.8.0_101'
Driver info: org.openqa.selenium.chrome.ChromeDriver
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: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.<init>(RemoteWebDriver.java:131)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:144)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:170)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:159)
at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:116)
at Testing.java.DemoTesting.main(DemoTesting.java:12)
How to solve the problem tell me any one