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java.lang.NullPointerException at hudson.plugins.selenium.callables.SeleniumCallable.invoke(SeleniumCallable.java:112) at hudson.plugins.selenium.callables.SeleniumCallable.invoke(SeleniumCallable.java:24) at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2719) at hudson.remoting.UserRequest.perform(UserRequest.java:120) at hudson.remoting.UserRequest.perform(UserRequest.java:48) at hudson.remoting.Request$2.run(Request.java:326) at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at hudson.remoting.Engine$1$1.run(Engine.java:62) at java.lang.Thread.run(Unknown Source)