eclipse中的web.xml报错问题

Question

我配置的web.xml中报的错误是：
Referenced file contains errors (jar:file:/D:/eclipse/eclipse-jee-galileo-SR1-win32/eclipse/plugins/org.eclipse.wst.standard.schemas_1.0.200.v200902270215.jar!/
dtds/loose.dtd). For more information, right click on the message in the Problems View and select "Show Details..."

报错的位置是：
<?xml version="1.0" encoding="UTF-8"?>
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_4.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_4.xsd"
id="WebApp_ID" version="2.4">

希望有人给我解决下。谢谢！