eclipse自动创建项目出错Cannot change version of project facet Dynamic Web Module to 2.3.

Cannot change version of project facet Dynamic Web Module to 2.3.

step1:修改properties

step2:修改web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">

<display-name>Archetype Created Web Application</display-name>
</web-app>