Unknown attribute type (String) for attribute folder.

[Edoardo Panfili]

hi,
I have a custom tag that seems not work as I need.
I need th use the tag with a parameter that I know only at run time. For 
this reason I put
<rtexprvalue>true</rtexprvalue> in the tag description.
When I use the tag Tomcat (5.5.17) raises that exception:
11-ago-2006 10.55.47 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /folder.jsp(5,0) Unknown attribute 
type (String) for attribute folder.

What I did wrong?

thank you
Edoardo

===============taglib.tld fragment=============================
<taglib xmlns="http://java.sun.com/xml/ns/j2ee";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
web-jsptaglibrary_2_0.xsd"
    version="2.0">

   <tlib-version>1.1</tlib-version>
   <short-name>mbox</short-name>

   <tag>

      <description>Retrieve the folder list</description>
      <icon>
      </icon>
      <name>folderList</name>
      <tag-class>it.aspix.mailbox.tags.FolderList</tag-class>
      <body-content>empty</body-content>

      <attribute>
         <description>Retrieve the folder list</description>
         <name>folder</name>
         <required>false</required>
           <rtexprvalue>true</rtexprvalue>
           <type>String</type>
      </attribute>
   </tag>
</taglib>
===============================================================

============================folder.jsp fragment================
<%@ page language="java" contentType="text/html; charset=UTF-8" 
pageEncoding="UTF-8"%>
<%@ taglib uri="http://vnr.unipg.it/mailbox/mbox"; prefix="mbox" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"; %>
<mbox:html>
<mbox:folderList folder="${param.folder}"/>
===============================================================

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