Hello to all,

I am using struts as a framework and tomcat as servlet container ,
I try to run a little appilcation that i wrote using struts , i put all the jars and i get an exception in first page like this one :

Java Code: 
type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: Module 'null' not found.
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:476)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause 

java.lang.NullPointerException: Module 'null' not found.
	org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:755)
	org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:364)
	org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:285)
	org.apache.struts.taglib.html.LinkTag.calculateURL(LinkTag.java:445)
	org.apache.struts.taglib.html.LinkTag.doEndTag(LinkTag.java:353)
	org.apache.jsp.index_jsp._jspx_meth_html_005flink_005f0(index_jsp.java:150)
	org.apache.jsp.index_jsp._jspx_meth_html_005fhtml_005f0(index_jsp.java:103)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:67)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.23 logs.
if someone can help me to give some clue what is wrong ...

thanks