java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at nu.validator.servlet.VerifierServletTransaction.useXhtml5Schema(VerifierServletTransaction.java:895)
at nu.validator.servlet.VerifierServletTransaction.setupXmlParser(VerifierServletTransaction.java:1553)
at nu.validator.servlet.Html5ConformanceCheckerTransaction.loadDocAndSetupParser(Html5ConformanceCheckerTransaction.java:114)
at nu.validator.servlet.VerifierServletTransaction.validate(VerifierServletTransaction.java:966)
at nu.validator.servlet.PageEmitter.emit(PageEmitter.java:28)
at nu.validator.servlet.VerifierServletTransaction.service(VerifierServletTransaction.java:808)
at nu.validator.servlet.VerifierServlet.doPost(VerifierServlet.java:294)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)
at nu.validator.servlet.MultipartFormDataFilter.doFilter(MultipartFormDataFilter.java:185)
at nu.validator.servlet.InboundGzipFilter.doFilter(InboundGzipFilter.java:60)
at nu.validator.servlet.InboundSizeLimitFilter.doFilter(InboundSizeLimitFilter.java:63)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83)
at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:300)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at java.lang.Thread.run(Thread.java:745)

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