JSTL 's function tag

I have tried to use function tag in my jsp page. However, I kept receiving this error message:
<h3>Validation error messages from TagLibraryValidator for c</h3><p>35: tag = 'out' / attribute = 'value': An error occurred while parsing custom action attribute "value" with value "${fn:toUpperCase(who)}": org.apache.taglibs.standard.lang.jstl.parser.ParseException: EL functions are not supported.</p>
It seems that I got some configuration problem with function tag, but can't find out what it exactly is. The core, xml, sql, fmt tags all could run properly, I really can't understand what is wrong with function. I am using jstl 1.1 and located in the lib folder. I addressed
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
on the top of the page.
Please help me out. Many thanks

It dosen't work with out c:out. I found that I got
different error messages if I address
uri= "http://java.sun.com/jsp/jstl/functions" and
"http://java.sun.com/jstl/functions" (no /jsp)
Use the one with /jsp if you are using JSTL 1.1
Use the ont without /jsp if you are using JSTL1.0
>
the second one shows
The absolute uri: http://java.sun.com/jstl/functions
cannot be resolved in either web.xml or the jar files
deployed with this applicationProbably means you have JSTL 1.1
I have already put the fn.tld file in the WEB-INF
folder and mapped it in the web.xml. Take it out! All you need to do for JSTL 1.1 is put the standard.jar and jstl.jar into the WEB-INF/libs directory. No web.xml changes, no .tld placement, all that is handled in the JARS you put in the /lib directory.
The IDE I am
using is netBean 3.6. Anything else I missed? Please
help me out. Thanks

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Sorry for not formatting the code. Here goes!
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<%@ page language="java" contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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