使用JSF时出现的很低级的问题，求帮助啊！！！！

org.apache.jasper.JasperException: An exception occurred processing JSP page /error.jsp at line 63: <%@ taglib prefix="h" uri="http://java.sun.com/jsf/html" %>
4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5: <html>
6:  <f:view>
7:  <head>
8:  <title>asdf</title>
9:  </head>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:551)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
root cause java.lang.RuntimeException: FacesContext not found
javax.faces.webapp.UIComponentClassicTagBase.getFacesContext(UIComponentClassicTagBase.java:321)
javax.faces.webapp.UIComponentClassicTagBase.setJspId(UIComponentClassicTagBase.java:228)
org.apache.jsp.error_jsp._jspx_meth_f_005fview_005f0(error_jsp.java:94)
org.apache.jsp.error_jsp._jspService(error_jsp.java:69)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)