Invalid content error in struts.xml file.

[Joy Vergis]

I am trying a sample struts2 project. I have installed, Tomcat7,JDK7 and import Struts2 api in the project. I get the error at '<struts>' tag in the struts.xml file

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<package name="com.struts2.sample.progs" extends="struts-default">
		<action name="HelloWorld" class="com.struts2.sample.progs.First">
			<result>First.jsp</result>
		</action>
	</package>
</struts>

Error:
cvc-complex-type.2.4.a: Invalid content was found starting with element 'struts'. One of '{"http://
java.sun.com/xml/ns/javaee":module-name, "http://java.sun.com/xml/ns/javaee":description, "http://
java.sun.com/xml/ns/javaee":display-name, "http://java.sun.com/xml/ns/javaee":icon, "http://
java.sun.com/xml/ns/javaee":distributable, "http://java.sun.com/xml/ns/javaee":context-param,
"http://java.sun.com/xml/ns/javaee":filter, "http://java.sun.com/xml/ns/javaee":filter-mapping,
"http://java.sun.com/xml/ns/javaee":listener, "http://java.sun.com/xml/ns/javaee":servlet, "http://
java.sun.com/xml/ns/javaee":servlet-mapping, "http://java.sun.com/xml/ns/javaee":session-config,
"http://java.sun.com/xml/ns/javaee":mime-mapping, "http://java.sun.com/xml/ns/javaee":welcome-
file-list, "http://java.sun.com/xml/ns/javaee":error-page, "http://java.sun.com/xml/ns/javaee":jsp-
config, "http://java.sun.com/xml/ns/javaee":security-constraint, "http://java.sun.com/xml/ns/
javaee":login-config, "http://java.sun.com/xml/ns/javaee":security-role, "http://java.sun.com/xml/ns/
javaee":env-entry, "http://java.sun.com/xml/ns/javaee":ejb-ref, "http://java.sun.com/xml/ns/
javaee":ejb-local-ref, "http://java.sun.com/xml/ns/javaee":service-ref, "http://java.sun.com/xml/ns/
javaee":resource-ref, "http://java.sun.com/xml/ns/javaee":resource-env-ref, "http://java.sun.com/
xml/ns/javaee":message-destination-ref, "http://java.sun.com/xml/ns/javaee":persistence-context-
ref, "http://java.sun.com/xml/ns/javaee":persistence-unit-ref, "http://java.sun.com/xml/ns/
javaee":post-construct, "http://java.sun.com/xml/ns/javaee":pre-destroy, "http://java.sun.com/xml/
ns/javaee":data-source, "http://java.sun.com/xml/ns/javaee":message-destination, "http://
java.sun.com/xml/ns/javaee":locale-encoding-mapping-list, "http://java.sun.com/xml/ns/
javaee":absolute-ordering}' is expected.