Java EE (Java Enterprise Edition) General Discussion

Hi
I've tried to run a jsp page that uses the following taglib attribute:
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
but it comes up with the error message :
Unable to read TLD "META-INF/c-1_0.tld" from JAR file "file:/C:/jakarta/jakarta-tomcat-5.0.19/webapps/ROOT/WEB-INF/lib/standard.jar": java.lang.IllegalStateException: zip file closed

I've unzipped the standard.jar file to make sure that the c-1_0.tld file is there and it is actually there, I've also downloaded the latest version of the taglib but both actions have not solved my problem.
The same error message comes up when i use the taglib
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %>
it says
Unable to read TLD "META-INF/sql-1_0.tld" from JAR file "file:/C:/jakarta/jakarta-tomcat-5.0.19/webapps/ROOT/WEB-INF/lib/standard.jar": java.lang.IllegalStateException: zip file closed.

This is really slowing things down as I cant get to use any of the standard taglib

please I need help
abiose