Selenium Grid cannot able create a new session error is showing - selenium-grid

Question

I am learning Selenium Grid and beginner for it.I setup my hub by using command:-
java -jar selenium-server-standalone-3.3.0.jar -role hub
and node is setup by using command:- java -jar selenium-server-standalone-3.3.0.jar -role webdriver -hub IP_of_hub:4444/grid/register -port 1234
Than i created a java project and created a class and write the down the code
import junit.framework.Assert;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.xerces.util.URI.MalformedURIException;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.Platform;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
public class selGrid {
WebDriver driver;
String base_url,node_url;
#BeforeTest
public void setUp() throws MalformedURLException{
System.setProperty("webdriver.gecko.driver","C://Users//Administrator//Downloads//geckodriver.exe");
base_url="http://newtours.demoaut.com";
node_url="http://localhost:1234/wd/hub";
DesiredCapabilities capability=DesiredCapabilities.firefox();
capability.setBrowserName("firefox");
capability.setPlatform(Platform.WINDOWS);
driver=new RemoteWebDriver(new URL(node_url),capability);
}
#AfterTest
public void afterTest()
{
driver.quit();
}
public void simpleTest()
{
driver.get(base_url);
Assert.assertEquals("Welcome", driver.getTitle());
}
}}
And run it is as TestNGand in the console below text is showing
FAILED CONFIGURATION: #BeforeTest setUp org.openqa.selenium.SessionNotCreatedException: Unable to create new remote session. desired capabilities = Capabilities [{marionette=true, browserName=firefox, moz:firefoxOptions= {binary=Optional[FirefoxBinary(C:\Program Files (x86)\Mozilla Firefox\firefox.exe)], args=[], legacy=null, logLevel=null, prefs={}, profile=null}, version=, platform=WINDOWS}], required capabilities = Capabilities [{}]
Build info: version: '3.3.0', revision: 'b526bd5', time: '2017-03-07 11:21:31 -0800'
System info: host: 'UNO-13-PC', ip: '192.168.0.4', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_121'
Driver info: driver.version: FirefoxDriver
Command duration or timeout: 0 milliseconds
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:216)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:363)
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:113)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:141)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:604)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:244)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:131)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:158)
at selGrid.setUp(selGrid.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:146)
at org.testng.TestRunner.beforeRun(TestRunner.java:626)
at org.testng.TestRunner.run(TestRunner.java:594)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
at org.testng.SuiteRunner.run(SuiteRunner.java:289)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
at org.testng.TestNG.runSuites(TestNG.java:1144)
at org.testng.TestNG.run(TestNG.java:1115)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)
Caused by: org.openqa.selenium.SessionNotCreatedException: Unable to create new remote session. desired capabilities = Capabilities [{marionette=true, browserName=firefox, moz:firefoxOptions= {binary=Optional[FirefoxBinary(C:\Program Files (x86)\Mozilla Firefox\firefox.exe)], args=[], legacy=null, logLevel=null, prefs={}, profile=null}, version=, platform=WINDOWS}], required capabilities = Capabilities [{}]
Build info: version: '3.3.0', revision: 'b526bd5', time: '2017-03-07 11:21:31 -0800'
System info: host: 'UNO-13-PC', ip: '192.168.0.4', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_121'
Driver info: driver.version: FirefoxDriver
Build info: version: '3.3.0', revision: 'b526bd5', time: '2017-03-07 11:21:31 -0800'
System info: host: 'UNO-13-PC', ip: '192.168.0.4', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_121'
Driver info: driver.version: FirefoxDriver
at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:126)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:141)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:82)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:604)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:244)
at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:131)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:243)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:121)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:164)
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.server.FirefoxDriverProvider.callConstructor(FirefoxDriverProvider.java:81)
at org.openqa.selenium.remote.server.FirefoxDriverProvider.newInstance(FirefoxDriverProvider.java:63)
at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance(DefaultDriverFactory.java:60)
at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:222)
at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:209)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:176)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
SKIPPED CONFIGURATION: #AfterTest afterTest
===============================================
Default test
Tests run: 0, Failures: 0, Skips: 0
Configuration Failures: 1, Skips: 1
===============================================
===============================================
Default suite
Total tests run: 0, Failures: 0, Skips: 0
Configuration Failures: 1, Skips: 1
===============================================

Answer 1

Set the path of geckodriver and use the latest version of firefox(or one can check compatible firefox for standalone server).
Now I used firefox ver 52.0.2 and standalone server is 3.3.0