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webMathematica problem


Hi there,

I can't run my webMathematica due the following problem? 
Can anyone tell me the cause and solution to the problem? 

Thanks,
David


HTTP Status 500 - 
________________________________________
type Exception report
message 
description The server encountered an internal error () that prevented it
from fulfilling this request.
exception 
javax.servlet.ServletException: A Kernel cannot be activated.
	
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextI
mpl.java:825)
	
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImp
l.java:758)
	org.apache.jsp.Examples.Plot_jsp._jspService(Plot_jsp.java:111)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3
24)
	
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:802)
root cause 
javax.servlet.jsp.JspTagException: A Kernel cannot be activated.
	com.wolfram.webmathematica.tags.AllocateKernel.doStartTag(Unknown
Source)
	
org.apache.jsp.Examples.Plot_jsp._jspx_meth_msp_allocateKernel_0(Plot_jsp.ja
va:128)
	org.apache.jsp.Examples.Plot_jsp._jspService(Plot_jsp.java:91)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:3
24)
	
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:802)
note The full stack trace of the root cause is available in the Apache
Tomcat/5.0.28 logs.
________________________________________
Apache Tomcat/5.0.28



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