ORA-01031: insufficient privileges

ORA-01031: insufficient privileges

Cause: An attempt was made to change the current username or password  without the appropriate privilege. This error also occurs if attempting to install a  database without the necessary operating system privileges. When Trusted Oracle  is configure in DBMS MAC, this error may occur if the user was granted the  necessary privilege at a higher label than the current login.
Action: Ask the database administrator to perform the operation or grant the  required privileges. For Trusted Oracle users getting this error although granted  the the appropriate privilege at a higher label, ask the database administrator to  regrant the privilege at the appropriate label.