ORA-04068: existing state of packages has been discarded

The Below Error happened Usually In RAC environment, and its Indicate to Bugs and you can avoid this error as Work around :

 SQL> alter system set “_disable_fast_validate”=true scope=both;

Please be Noted there’s No Restart need After Modify This Parameter.

Also For Better Solution you can upgrade to Or apply Patch Number 9681133 Which Can Be Downloaded From Https://support.oracle.com

Thank you
Osama Mustafa