jsf报错Both MyFaces and the RI are on your classpath

新来的大家多多关照
jsf+spring+hibernate+myfaces
运行时报错：

ERROR - Both MyFaces and the RI are on your classpath. Please make sure to use only one of the two JSF-implementations.
ERROR - Exception in PhaseListener RESTORE_VIEW 1 beforePhase.
java.lang.NullPointerException
    at com.sun.faces.lifecycle.ELResolverInitPhaseListener.beforePhase(ELResolverInitPhaseListener.java:100)
    at org.apache.myfaces.lifecycle.PhaseListenerManager.informPhaseListenersBefore(PhaseListenerManager.java:73)
    at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:93)
    at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
    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:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Unknown Source)
ERROR - Exception in PhaseListener RENDER_RESPONSE 6 beforePhase.
java.lang.NullPointerException
    at com.sun.faces.lifecycle.ELResolverInitPhaseListener.beforePhase(ELResolverInitPhaseListener.java:100)
    at org.apache.myfaces.lifecycle.PhaseListenerManager.informPhaseListenersBefore(PhaseListenerManager.java:73)
    at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:134)
    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:293)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
    at java.lang.Thread.run(Unknown Source)


[ 本帖最后由 liuwenqi 于 2009-9-13 22:27 编辑 ]
----------------解决方案--------------------------------------------------------
，你代码里跟一下，看是到那句出的错！
----------------解决方案--------------------------------------------------------