Sybase ASA Error -98: Authentication violation

I have used Sybase sql anywhere to store data.

My application connect to Sybase database through hibernate. When i try to update database first time it allows to update data next time onwards sybase does not allow to update database and it gives error : ASA Error -98: Authentication violation.

I want to know why sybase gives Authentication violation.

What should i do to update data properly ?

Thanks,
Hiren