java.net.BindException: Selenium is already running on port 4444. Or some other service is.
   at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:492)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   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.netbeans.modules.selenium2.server.Selenium2ServerSupport.callSeleniumServerMethod(Selenium2ServerSupport.java:238)
   at org.netbeans.modules.selenium2.server.Selenium2ServerSupport.run(Selenium2ServerSupport.java:204)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)