Deployment descriptor "web.xml" is malformed

Hi

I am using Weblogic Express 8.1 SP5, when I deploy my application it shows the following Warning:

<Feb 15, 2006 4:51:49 PM NZDT> <Warning> <HTTP> <BEA-101248> <[Application: '/opt/local/WeblogicExpress_8.1_SP5/servers/oss_ssl/applications', Module: 'oss_ssl']: Deployment descriptor "web.xml" is malformed. Check against the DTD: org.xml.sax.SAXParseException: The content of element type "distributable" must match "EMPTY". (line 20, column 39).>
<Feb 15, 2006 4:51:49 PM NZDT> <Warning> <HTTP> <BEA-101248> <[Application: '/opt/local/WeblogicExpress_8.1_SP5/servers/oss_ssl/applications', Module: 'oss_ssl']: Deployment descriptor "web.xml" is malformed. Check against the DTD: org.xml.sax.SAXParseException: The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)". (line 31, column 11).>

This is the web.xml file :

<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
  <display-name>Test</display-name>
  <description>Test web service</description>
  <session-config>
    <session-timeout>300</session-timeout>
  </session-config>
  <mime-mapping>
    <extension>txt</extension>
    <mime-type>text/plain</mime-type>
  </mime-mapping>
  <mime-mapping>
    <extension>html</extension>
    <mime-type>text/html</mime-type>
  </mime-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
 </welcome-file-list>
  <distributable>false</distributable>
                   
 <security-constraint>
    <web-resource-collection>
      <web-resource-name>All</web-resource-name>
      <url-pattern>/*</url-pattern>
    </web-resource-collection>
    <user-data-constraint>
      <transport-guarantee>CONFIDENTIAL</transport-guarantee>
    </user-data-constraint>
  </security-constraint>
</web-app>


I tried all the possibilities to eliminate this warning. I checked in BEA site for this error :BEA-101248 , but the information given didnt solve my problem.
Please help me as the application is going for production and its urgent.

Thanks
Godwin.