ORA-04042: procedure 12c PDB

Gurus, My application uses UTL_MAIL and i installed it the utlmail.sql and prvtmail.pb on root container but i can see or grant execute on this package from PDB getting the below error.     CON_ID CON_NAME                      OPEN MODE  RESTRICTED ---------- ------------------------------ ---------- ----------         2 PDB$SEED                      READ ONLY  NO         3 PF01PDB                      READ WRITE NO SQL> ALTER SESSION SET CONTAINER=PF01PDB; Session altered. SQL> grant execute on sys.utl_mail to prxw01; grant execute on sys.utl_mail to grediag                     * ERROR at line 1: ORA-04042: procedure, function, package, or package body does not exist Thanks in advance