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java.lang.IllegalStateException: getWriter() has already been called for this response	at org.apache.coyote.tomcat4.CoyoteResponse.getOutputStream(CoyoteResponse.java:586)	at org.apache.coyote.tomcat4.CoyoteResponseFacade.getOutputStream(CoyoteResponseFacade.java:158)	at javax.servlet.ServletResponseWrapper.getOutputStream(ServletResponseWrapper.java:136)	at javax.servlet.ServletResponseWrapper.getOutputStream(ServletResponseWrapper.java:136)	at org.apache.velocity.servlet.VelocityServlet.error(VelocityServlet.java:656)	at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:402)	at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:333)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:575)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:498)	at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:169)	at com.atlassian.confluence.util.profiling.ProfilingPageFilter.applyDecorator(ProfilingPageFilter.java:24)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:68)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:84)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:95)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.confluence.setup.SpringSessionInViewFilter.doFilterInternal(SpringSessionInViewFilter.java:29)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:39)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:148)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:38)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)	at java.lang.Thread.run(Thread.java:534)