Cause
The use of the SYSDBA package requires the LBAC_DBA role.
The use of the SYSDBA package requires the LBAC_DBA role.
Grant the LBAC_DBA role to the database user.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12400.htm
Browse all solutions to database errors from Oracle, MS SQL, or MySQL