Can anyone explain my error????

i get this error and i cannot quite undersand it:
java.lang.NoSuchMethodError: javax.servlet.http.HttpSession: method getAttribute(Ljava/lang/String;)Ljava/lang/Object; not found
     at com.mapinfo.jsptags.util.MappingSession.getMappingSession(Unknown Source)
     at _webapp._mapviewer._index._jspService(_index.java:58)
     at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
     at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
     at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
     at oracle.jsp.JspServlet.internalService(JspServlet.java, Compiled Code)
     at oracle.jsp.JspServlet.service(JspServlet.java:148)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
     at org.apache.jserv.JServConnection.processRequest(JServConnection.java:435)
     at org.apache.jserv.JServConnection.run(JServConnection.java, Compiled Code)
     at java.lang.Thread.run(Thread.java, Compiled Code)can anyone give me a explenation of this error please
marc.

Open "_webapp._mapviewer._index.java" file from your webserver response root.
In tomcat this file will be under "....\Tomcat\work\localhost_8080\".
In that file, come to the line number 58, and you can find out what is the problem, I think you may have some basic syntax problem.
If still you are stuggling, then just cut and paste that particular set of code, then others can understand the exact problem.
Regards...

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