HTTP Status 404 - There is no Action mapped for namespace struts2

struts2 出现 HTTP Status 404 - There is no Action mapped for namespace错误
在struts配置文件中:

<package name="management.gridMemberInfo" namespace="/management/gridMemberInfo" extends="web.manager">
    <action name="gmi_" method="{1}" class="com.jpsycn.kfwggl.management.action.GridMemberInfoAction">
        <interceptor-ref name="web-stack" />
        <result name="toMain">/WEB-INF/management/grid_member_info.jsp</result>
    </action>
</package>

可能原因:1.extends写错了
2.name="gmi_"少写了个*,name="gmi_*"