--	connect as sys
SQL> connect sys/sys
Connected.
-- 	check the status of package standard
SQL> select object_name,status from dba_objects where OBJECT_NAME='STANDARD';

OBJECT_NAM STATUS
---------- -------
STANDARD   VALID
STANDARD   VALID

-- if invalid status then , recompile it

SQL> alter package standard compile;

Package altered.

-- 	try to business again.
-- 	still error? then recrecreate the object logged in as sys.
-- 	run the following script as sys

SQL> @$ORACLE_HOME/rdbms/admin/catproc.sql