javax.servlet.ServletException: java.lang.NullPointerException

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

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