No action config found for the specified url.不知道是怎么回事，总是找不到错误在那里

ava.lang.RuntimeException: javax.servlet.ServletException: org.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
cn.itcast.oa.web.filter.OpenSessionInViewFilter.doFilter(OpenSessionInViewFilter.java:39)
cn.itcast.oa.web.filter.CheckPrivilegeFilter.doFilter(CheckPrivilegeFilter.java:42)
cn.itcast.oa.web.filter.SetRequestSetCharacterEncodingFilter.doFilter(SetRequestSetCharacterEncodingFilter.java:23)
root causejavax.servlet.ServletException: org.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
cn.itcast.oa.web.filter.OpenSessionInViewFilter.doFilter(OpenSessionInViewFilter.java:31)
cn.itcast.oa.web.filter.CheckPrivilegeFilter.doFilter(CheckPrivilegeFilter.java:42)
cn.itcast.oa.web.filter.SetRequestSetCharacterEncodingFilter.doFilter(SetRequestSetCharacterEncodingFilter.java:23)
root causeorg.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
org.apache.struts.chain.commands.AbstractSelectAction.execute(AbstractSelectAction.java:71)
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
cn.itcast.oa.web.filter.OpenSessionInViewFilter.doFilter(OpenSessionInViewFilter.java:31)
cn.itcast.oa.web.filter.CheckPrivilegeFilter.doFilter(CheckPrivilegeFilter.java:42)
cn.itcast.oa.web.filter.SetRequestSetCharacterEncodingFilter.doFilter(SetRequestSetCharacterEncodingFilter.java:23)