struts ActionErrors问题？struts in action在哪有下载?

ActionError cannot be resolved or is not a type－－
你没有import你的ActionError类。
package com.youcompany.struts.form;import javax.servlet.http.HttpServletRequest;import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;import org.apache.struts.action.ActionError;