ContainerBase.addChild: start:这错误怎么办？

严重: ContainerBase.addChild: start: 

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MicroMessage]]

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

运行的时候就报了这个错，百度说是xml配置不对，那么请帮我看看xml代码哪错了？

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>ListServlet</servlet-name>
    <servlet-class>Servlet.ListServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ListServlet</servlet-name>
    <url-pattern>list.action</url-pattern>
  </servlet-mapping>	
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>