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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:212)	at org.openqa.selenium.support.ui.FluentWait.(FluentWait.java:102)	at org.openqa.selenium.support.ui.WebDriverWait.(WebDriverWait.java:71)	at org.openqa.selenium.support.ui.WebDriverWait.(WebDriverWait.java:45)	at com.SF.Pages.SFQA_Administrator.(SFQA_Administrator.java:17)	at com.SF.TestCases.Administrator_Test_Case.(Administrator_Test_Case.java:16)	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.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:29)	at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:382)	at org.testng.internal.ClassHelper.createInstance(ClassHelper.java:295)	at org.testng.internal.ClassImpl.getDefaultInstance(ClassImpl.java:118)	at org.testng.internal.ClassImpl.getInstances(ClassImpl.java:183)	at org.testng.internal.TestNGClassFinder.(TestNGClassFinder.java:128)	at org.testng.TestRunner.initMethods(TestRunner.java:416)	at org.testng.TestRunner.init(TestRunner.java:242)	at org.testng.TestRunner.init(TestRunner.java:212)	at org.testng.TestRunner.(TestRunner.java:166)	at org.testng.remote.RemoteTestNG$1.newTestRunner(RemoteTestNG.java:143)	at org.testng.remote.RemoteTestNG$DelegatingTestRunnerFactory.newTestRunner(RemoteTestNG.java:272)	at org.testng.SuiteRunner$ProxyTestRunnerFactory.newTestRunner(SuiteRunner.java:587)	at org.testng.SuiteRunner.init(SuiteRunner.java:161)	at org.testng.SuiteRunner.(SuiteRunner.java:114)	at org.testng.TestNG.createSuiteRunner(TestNG.java:1290)	at org.testng.TestNG.createSuiteRunners(TestNG.java:1277)	at org.testng.TestNG.runSuitesLocally(TestNG.java:1131)	at org.testng.TestNG.run(TestNG.java:1048)	at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:112)	at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)	at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:176)