Version conflict

[Jawed Nazar Ali]

hi,
I just want to ask that i have created an application using servlet 2.3 and JSP 1.2 specification, but the application is working not working on my Oracle 9iAS [9.0.2.0.0], i think its aversion conflict. any buddy has idea what steps will lead me to run this application successfully.
for quick reference following is the error i am getting:

java.lang.NoSuchMethodError
at com.IWAYS.util.ApplicationListener.attributeRemoved(D:/my Projects/BTMAZ/src/com/IWAYS/util/ApplicationListener.java:63)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.EvermindHttpSession.removeAttribute(EvermindHttpSession.java:167)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.EvermindHttpSession.setAttribute(EvermindHttpSession.java:91)
at _include._MenuFooter._jspService(_MenuFooter.java:108)
[SRC:/Administrator/../Include/MenuFooter.jsp:87]
at com.orionserver[Oracle9iAS (9.0.2.0.0) Containers for J2EE].http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:302)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:407)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:330)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ServletRequestDispatcher.include(ServletRequestDispatcher.java:108)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.EvermindPageContext.include(EvermindPageContext.java:287)
at _administrator._Home1._jspService(_Home1.java:60)
[SRC:/Administrator/Home1.jsp:27]
at com.orionserver[Oracle9iAS (9.0.2.0.0) Containers for J2EE].http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:302)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:407)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:330)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:269)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:735)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].server.http.AJPRequestHandler.run(AJPRequestHandler.java:151)
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].util.ThreadPoolThread.run(ThreadPoolThread.java:64)

waiting for quick reply.
thanks in advance
Regards,
Jawed Nazar Ali