Issue with JspTaglibs user-directive

Freemarker is returning an error when I try to call a user-directive
(AjaxTags: http://ajaxtags.sourceforge.net/):

<#assign ajax=JspTaglibs["/WEB-INF/tld/ajaxtags.tld"]/>
<@ajax.select ... />

2009-03-04 13:34:42,966 ERROR []: freemarker.runtime
                        -
java.lang.IllegalAccessException: Class
freemarker.ext.jsp.JspTagModelBase can not access a member of class
net.sourceforge.ajaxtags.tags.BaseAjaxBodyTag with modifiers "public
final"
The problematic instruction:
----------
==> user-directive ajax.select

Java backtrace for programmers:
----------
freemarker.template.TemplateModelException:
java.lang.IllegalAccessException: Class
freemarker.ext.jsp.JspTagModelBase can not access a member of class
net.sourceforge.ajaxtags.tags.BaseAjaxBodyTag with modifiers "public
final"
	at freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:136)
	at freemarker.core.Environment.visit(Environment.java:285)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
	at freemarker.core.Environment.visit(Environment.java:209)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:209)
	at freemarker.core.Environment.process(Environment.java:189)
	at freemarker.template.Template.process(Template.java:237)
	at org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:187)
	at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
...

In JSP works normally, even when importing JSP via Freemarker:

<@s.include value="/localidades.jsp" />

Any idea what could be causing the error? I'm using Freemarker 2.3.15

-- 
Max
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