请问struts2中，如何在拦截器里加入actionerror?

查看<s:actionerror />的源码用：
request.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
和
new ActionError(stack,request,response);
都出现异常：
org.apache.struts2.components.UIBean.end(UIBean.java:486)
error when rendering
java.lang.NullPointerException
        at org.apache.struts2.views.freeer.FreeerManager.getConfiguratio
n(FreeerManager.java:150)
        at org.apache.struts2.components.template.FreeerTemplateEngine.rende
rTemplate(FreeerTemplateEngine.java:84)
        at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:530)
        at org.apache.struts2.components.UIBean.end(UIBean.java:484)
        at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTa
gSupport.java:43)
        at org.apache.jsp.Error_jsp._jspx_meth_s_005factionerror_005f0(Error_jsp
.java:123)
        at org.apache.jsp.Error_jsp._jspService(Error_jsp.java:75)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:328)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
15)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:269)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:691)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica
tionDispatcher.java:469)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD
ispatcher.java:403)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis
patcher.java:301)
        at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(Servl
etDispatcherResult.java:139)
        at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResul
tSupport.java:178)
        at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(Default
ActionInvocation.java:348)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:253)
        at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.j
ava:50)
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.jav
a:504)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatc
her.java:419)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:210)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:174)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:117)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:108)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:151)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:870)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:665)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:528)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:81)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:685)
        at java.lang.Thread.run(Thread.java:595)