Sudhir,
That error indicates either you have multiple backends attempting to authenticate the user and one or more are not returning a successful authentication or the user/pwd combination is incorrect.
Please double-check the settings for the Backends in the SMP Management Cockpit. Verify that only the Java Backend connection has the Enable Authentication and Enable Previous user Authentication checked.
You may want to check the Print Business Logic Stack Trace and Print Stack Trace options for the Java backend to possibly get more details on the error.
--Bill