ORA-00993
Tried to grant an object privilege to an user, but it failed with ORA-00993.
SQL> grant select on hr.employees to sh with admin option;
grant select on hr.employees to sh with admin option
*
ERROR at line 1:
ORA-00993: missing GRANT keyword
ORA-00993 means that granting object privileges can't use WITH ADMIN OPTION, the only valid modifier is WITH GRANT OPTION.
SQL> grant select on hr.employees to sh with grant option;
Grant succeeded.
That's it.