1642091 - "An error occured at session creation." when launching Web Intelligence Rich Client

When launching Web Intelligence Rich Client the following error occurs:

"An error occured at session creation."

Details:

com.sap.webi.client.toolkit.exception.WIException: java.lang.NullPointerException
                  at com.sap.webi.client.toolkit.exception.WIExceptionFactory.create(WIExceptionFactory.java:18)
                  at com.sap.webi.client.toolkit.internal.usersession.UserSessionRCImpl.logonWithSerializedSession(UserSessionRCImpl.java:132)
                  at com.sap.webi.client.toolkit.SessionContext.logonWithSerializedSession(SessionContext.java:90)
                  at com.sap.webi.ui.context.managers.SessionsManager.loginAndGetSessionContext(SessionsManager.ja va:321)
                  at com.sap.webi.ui.context.managers.SessionsManager.logOnRepository(SessionsManager.java:221)
                  at com.sap.webi.ui.c ontext.managers.SessionsManager.initFirstSession(SessionsManager.java:137)
                  at com.sap.webi.ui.RichClientMain$InitWorker.doInBackground(RichClientMain.java:260)
                  at com.sap.webi.ui.RichClientMain$InitWorker.doInBackground(RichClientMain.java:223)
                  at javax.swing.SwingWorker$1.call(SwingWorker.java:278)
                  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
                  at java.util.concurrent.FutureTask.run(FutureTask.java:138)
                  at javax.swing.SwingWorker.run(SwingWorker.java:317)
                  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
                  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
                  at java.lang.Thread.run(Thread.java:619)

• SAP BusinessObjects Business Intelligence 4.x
• Web Intelligence

start; fail; 3-tier; WRC; Webi, webintelligence 41, 42,BI4.3 , KBA , BI-RA-WBI , Web Intelligence , Problem