JSF Error Traced[line: 1] The markup in the document preceding the root element

JSF  一访问就出错了，大虾帮忙看看是什么错！谢谢！
2009-12-1 21:33:13 com.sun.facelets.FaceletViewHandler handleRenderException
严重: Error Rendering View[/userLogin.jsp]
com.sun.facelets.FaceletException: Error Parsing /userLogin.jsp: Error Traced[line: 1] The up in the document preceding the root element must be well-formed.
at com.sun.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:234)
at com.sun.facelets.compiler.Compiler.compile(Compiler.java:105)
at com.sun.facelets.impl.DefaultFaceletFactory.createFacelet(DefaultFaceletFactory.java:197)
at com.sun.facelets.impl.DefaultFaceletFactory.getFacelet(DefaultFaceletFactory.java:144)
at com.sun.facelets.impl.DefaultFaceletFactory.getFacelet(DefaultFaceletFactory.java:95)
at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:496)
at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:546)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
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:191)
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:845)
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(Thread.java:619)
2009-12-1 21:33:13 com.sun.faces.lifecycle.LifecycleImpl phase
警告: executePhase(RENDER_RESPONSE 6,com.sun.faces.context.FacesContextImpl@1000bcf) threw exception
com.sun.facelets.FaceletException: Error Parsing /userLogin.jsp: Error Traced[line: 1] The up in the document preceding the root element must be well-formed.
at com.sun.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:234)下面是userLogin.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %> <f:view>
<f:loadBundle var="bundle" basename="messages"></f:loadBundle>
<h:outputLabel value="#{bundle.login_label}"></h:outputLabel><br>

<h:form id="loginForm">
<h:outputLabel for="username" value="#{bundle.username_label}"></h:outputLabel>
<h:inputText id="username" value="#{UserBean.username}"></h:inputText><br/>

<h:outputLabel for="password" value="#{bundle.userpassword_label}"></h:outputLabel>
<h:inputSecret id="password" value="#{UserBean.password}"></h:inputSecret><br/>

<h:commandButton id="submit" value="LOGIN" action="#{UserBean.login}" type="submit"></h:commandButton>
</h:form>
</f:view>