ORA-04068 / Existing State Of Packages Has Been Discarded

I am trying to use dbms_jobs in Oracle 8i database.

This is the syntax I am using:

begin
dbms_job.submit(:jobno, 'SYSTEM.SHRINK_ROLLBACK_SEGS', '07-FEB-2007', NULL);
commit;
end;

i have defined the variable jobno as number!

And i am getting the error :

*
ERROR at line 1:
ORA-04068: existing state of packages has been discarded
ORA-04063: package body "SYS.DBMS_JOB" has errors
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at line 2

I then go and look at the Sys.dbms_job package and see its not compiling

I have this error:

(1): PLS-00201: identifier 'ANY_INSTANCE' must be declared
(2): PL/SQL: Item ignored
(3): PLS-00801: internal error [21076]
(4): PL/SQL: Item ignored