Error about preInvoke

When I writing a method to invoked a EJB ,It thrown below exception.
In the "getUserByLoginID" Method, it looks up a JNDI name to get a DataSource,and then get a connection via the dataSource to access DB. It seems to be caused by T3 protocol of weblogic. But It still can't work since I have opened t3 protocol.
Any ideas?
<2007-8-17 ??06?59?57? CST> <Error> <HTTP> <BEA-101020> <[ServletContext(id=11373565,name=web,context-path=/web)] Servlet failed with Exception
java.lang.NoSuchMethodError: weblogic.ejb20.internal.StatelessEJBObject.preInvoke(Lweblogic/ejb20/internal/MethodDescriptor;Lweblogic/security/service
/ContextHandler;)Lweblogic/ejb20/interfaces/InvocationWrapper;
at com.test.spy.ejb.spyservice.SpyService_nochfv_EOImpl.getUserByLoginID(SpyService_nochfv_EOImpl.java:409)
at com.test.biz.spy.dao.SpyServiceDAORemoteEJBImpl.getUserByLoginID(Unknown Source)
at com.test.cis.web.CISRequestFilter.initWebSession(CISRequestFilter.java:218)
at com.test.cis.web.CISRequestFilter.doFilter(CISRequestFilter.java:87)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.test.cis.web.util.filter.GZIPFilter.doFilter(GZIPFilter.java:56)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6724)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
>

FYI:
RMI communications in WebLogic Server use the T3 protocol to transport data between WebLogic Server and other Java programs, including clients and other WebLogic Server instances. A server instance keeps track of each Java Virtual Machine (JVM) with which it connects, and creates a single T3 connection to carry all traffic for a JVM. See "Configure T3 protocol" in Administration Console Online Help.
For example, if a Java client accesses an enterprise bean and a JDBC connection pool on WebLogic Server, a single network connection is established between the WebLogic Server JVM and the client JVM. The EJB and JDBC services can be written as if they had sole use of a dedicated network connection because the T3 protocol invisibly multiplexes packets on the single connection.
-from :http://edocs.bea.com/wls/docs91/rmi/rmi_t3.html

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