strange problem with tomcat 5.0.25

Hi all,

I integrated struts-menu in my struts application with tomcat 5.0.25. 
But sometime I got the error below. The very strange thing is that if I 
connect the computer to internet and stop/restart tomcat all work fine.

Please CC to me, since I do not subscribed to this list.

javax.servlet.ServletException: Can't get definitions factory from context.
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:73)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:298)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)

*root cause*

javax.servlet.jsp.JspException: Can't get definitions factory from context.
	org.apache.struts.taglib.tiles.InsertTag.processDefinitionName(InsertTag.java:575)
	org.apache.struts.taglib.tiles.InsertTag.createTagHandler(InsertTag.java:474)
	org.apache.struts.taglib.tiles.InsertTag.doStartTag(InsertTag.java:436)
	org.apache.jsp.index_jsp._jspx_meth_tiles_insert_0(index_jsp.java:89)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:64)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:298)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)




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