title: Protractor - When i start the "webdriver-manager start" error Failed to start: SocketListener0@0.0.0.0:4444 displayed
body: <p>when i start the webdriver-manager below error displayed kindly help on this.</p>
  
  <blockquote>
    <p>seleniumProcess.pid: 8248 18:04:32.009 INFO - Launching a standalone
    Selenium Server Setting system property webdriver.chrome.driver to
    C:\Users\lokesh.m\AppData\Roa
    ming\npm\node_modules\protractor\selenium\chromedriver.exe
    18:04:32.602 INFO - Java: Oracle Corporation 25.71-b15 18:04:32.602
    INFO - OS: Windows 7 6.1 amd64 18:04:32.742 INFO - v2.47.1, with Core
    v2.47.1. Built from revision 411b314 18:04:33.085 INFO - Driver class
    not found: com.opera.core.systems.OperaDriver 18:04:33.085 INFO -
    Driver provider com.opera.core.systems.OperaDriver is not re gistered
    18:04:33.881 WARN - Failed to start: SocketListener0@0.0.0.0:4444
    Exception in thread "main" java.net.BindException: Selenium is already
    running o n port 4444. Or some other service is.
            at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:4
    92)
            at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:30
    5)
            at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:24
    5)
            at org.openqa.grid.selenium.GridLauncher.main(GridLauncher.java:64)
    Selenium Standalone has exited with code 1</p>
  </blockquote>
  
  <p>I tried by updating the JAVA as it was advised in some issues but it is not working.</p>