error in resolving sitemesh's JspTagLibs

Hello list,

I have a war file that runs fine in Tomcat, but when I run it under jetty, I
get the following error with Freemarker. Does anyone know what's going on?

Error on line 1, column 1 in WEB-INF/view/layout/default.ftl
JspTaglibs["http://www.opensymphony.com/sitemesh/decorator"] is undefined.
It cannot be assigned to decorator
The problematic instruction:
----------
==> assignment: decorator=JspTaglibs["
http://www.opensymphony.com/sitemesh/decorator"] [on line 1, column 1 in
WEB-INF/view/layout/default.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Error on line 1, column 1 in
WEB-INF/view/layout/default.ftl
JspTaglibs["http://www.opensymphony.com/sitemesh/decorator"] is undefined.
It cannot be assigned to decorator
    at freemarker.core.Assignment.accept(Assignment.java:111)
    at freemarker.core.Environment.visit(Environment.java:208)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:208)
    at freemarker.core.Environment.process(Environment.java:188)
    at freemarker.template.Template.process(Template.java:237)
    at
freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:427)
    at
freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:366)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)


-- 
Thanks,
Zemian Deng

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