javax.servlet.ServletException: java.lang.NullPointerException

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javax.servlet.ServletException: java.lang.NullPointerException
at org.openqa.grid.web.servlet.DisplayHelpServlet.getVersion(DisplayHelpServlet.java:105)
at org.openqa.grid.web.servlet.DisplayHelpServlet.(DisplayHelpServlet.java:40)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at java.lang.Class.newInstance(Class.java:442)
at org.seleniumhq.jetty9.server.handler.ContextHandler$Context.createInstance(ContextHandler.java:2372)
at org.seleniumhq.jetty9.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1166)

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