jasper erro?

ola galera
entao..
to gerando relatorio pela web..
quando o usuario clika no botao, ele chama meu metodo e gera normalmente, tudo certinho sem erro..
mas quando ele gera, aparece um erro no console.. mas nao afeta nada..

oq e isso??

java.lang.IllegalStateException: getOutputStream() has already been called for this response
	at org.apache.catalina.connector.Response.getWriter(Response.java:610)
	at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
	at com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:400)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:557)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:63)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)
30/06/2008 10:59:59 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.IllegalStateException
	at org.apache.catalina.connector.ResponseFacade.reset(ResponseFacade.java:310)
	at com.sun.facelets.FaceletViewHandler.handleRenderException(FaceletViewHandler.java:674)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:646)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:63)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

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