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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 org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)	at nu.validator.servlet.MultipartFormDataFilter.doFilter(MultipartFormDataFilter.java:185)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at nu.validator.servlet.InboundGzipFilter.doFilter(InboundGzipFilter.java:60)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)	at nu.validator.servlet.InboundSizeLimitFilter.doFilter(InboundSizeLimitFilter.java:63)	at org.eclipse.jetty.servlet.ServletHandler$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 org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)	at java.lang.Thread.run(Thread.java:745)