Cannot use the JSLT core at all !

Hello
I am trying to use the standard JSTL from Jakarta. I did the good import in
my JSP (<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>), I
downloaded the last version of the standard.jar and jstl.jar, I am using TOMCAT 5 and J2SE 1.4.2_06.
But I get always the same error at execution time :
null: java.lang.IllegalStateException: can't declare any more prefixes in this context
I don't understand where is the problem.

I finally found the topic.
But I have a different problem : here is the stack trace :
org.apache.jasper.JasperException: <h3>errors from TagLibraryValidator for c</h3><p>null: java.lang.IllegalStateException: can't declare any more prefixes in this context</p>
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:94)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:406)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:109)
     org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1570)
     org.apache.jasper.compiler.Validator.validate(Validator.java:1516)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:259)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:462)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:448)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:551)

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