Funny errors while using the OSB console

Could not deserialize session data. java.io.NotSerializableException: com.bea.console.taglib.html.model.TableModel





followed by

Could not deserialize session data.
java.lang.ClassCastException: cannot assign instance of com.bea.console.handles.JMXHandle to field com.bea.console.actionforms.ConsoleValidatorForm.handle of type com.bea.console.handles.Handle in instance of com.bea.console.actionforms.app.update.Form
 at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2032)
 at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1212)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1953)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
 at weblogic.common.internal.PassivationUtils.toObject(PassivationUtils.java:54)
 at weblogic.common.internal.PassivationUtils.toObject(PassivationUtils.java:46)
 at weblogic.common.internal.PassivationUtils.copy(PassivationUtils.java:64)
 at weblogic.servlet.internal.AttributeWrapper.getObject(AttributeWrapper.java:93)
 at weblogic.servlet.internal.AttributeWrapper.getObject(AttributeWrapper.java:43)
 at weblogic.servlet.internal.session.SessionData.getAttribute(SessionData.java:404)
 at weblogic.servlet.internal.ServletRequestImpl$SessionHelper.updateSessionId(ServletRequestImpl.java:2951)
 at weblogic.servlet.security.internal.SecurityModule.generateNewSession(SecurityModule.java:304)
 at weblogic.servlet.security.internal.SecurityModule.login(SecurityModule.java:291)
 at weblogic.servlet.security.internal.FormSecurityModule.processJSecurityCheck(FormSecurityModule.java:285)
 at weblogic.servlet.security.internal.FormSecurityModule.checkUserPerm(FormSecurityModule.java:209)
 at weblogic.servlet.security.internal.FormSecurityModule.checkAccess(FormSecurityModule.java:92)
 at weblogic.servlet.security.internal.ServletSecurityManager.checkAccess(ServletSecurityManager.java:82)
 at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2204)
 at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
 at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
 at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
 at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

never seen before.... trying to identify the cause....