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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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via Google Groups by Mohit Yadav, 11 months ago
via GitHub by panrufio
, 4 months ago
This exception has no message.
via GitHub by panrufio
, 2 years ago
This exception has no message.
java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770)	at org.openqa.selenium.interactions.Actions.(Actions.java:71)	at automationFramework.LoginTest.TestFireFox(LoginTest.java:50)	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.invokeMethod(Invoker.java:661)	at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:869)	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1193)	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)	at org.testng.TestRunner.privateRun(TestRunner.java:744)	at org.testng.TestRunner.run(TestRunner.java:602)	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)