Why do I keep getting this error?

I created a portal page with four portlets (one jsp portlet, and three db portlets) and after four or five times in which it works, I get the following error when I press the submit button:
500 Internal Server Error
java.lang.Error: Page constructor both pageId and pageName are null
     at oracle.webdb.event.Page.<init>(Unknown Source)
     at oracle.webdb.event.HttpEventContext.init(Unknown Source)
     at oracle.webdb.event.EventManager.doEvent(Unknown Source)
     at oracle.webdb.event.EventManager.doGet(Unknown Source)
     at oracle.webdb.event.EventServlet.doGet(Unknown Source)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:244)
     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)
Any ideas?

The error message indicates that an http request has
been sent to Portal's event servlet which is missing
the _pageid parameter used to determine which Portal
page the event was raised from.
I would suggest looking at the html source for any
form or link generating this request to see if they
omit the _pageid parameter. If they do then the code
generating them needs to be inspected. If necessary
you can post back the snippet of code that reproduces
the problem.
You might also find turning on debug logging in the
event servlet helps to diagnose such issues. To do
this set the servlet init param called 'logmode' to a
value of 'debug' and bounce your servlet container.
You will then start seeing debug output messages in
the servlet log for the event servletThe code is allright, and it works for about 6 or 7 times, after which I have to reboot the server in order to make it work again.
If I persist submitting the page, I eventually get a 500 error.
Maybe the 9iAS is not configured properly?

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