changing default password for WebLogic user and restarting gives SecurityInitializationException

I installed WebLogic 10g (latest release) and change the default password for WebLogic user from the WebLogic console, then I restarted the Oracle WebLogic server, but when It try to start give me an error:

####<Mar 23, 2009 2:47:42 PM MDT> <Critical> <WebLogicServer> <brallapa-us2> <AdminServer> <main> <<WLS Kernel>> <> <> <1237841262765> <BEA-000386> <Server subsystem failed. Reason: weblogic.security.SecurityInitializationException: Authentication for user weblogic denied

weblogic.security.SecurityInitializationException: Authentication for user weblogic denied

                at weblogic.security.service.CommonSecurityServiceManagerDelegateImpl.doBootAuthorization(Unknown Source)

                at weblogic.security.service.CommonSecurityServiceManagerDelegateImpl.initialize(Unknown Source)

                at weblogic.security.service.SecurityServiceManager.initialize(Unknown Source)

                at weblogic.security.SecurityService.start(SecurityService.java:141)

                at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)