ORA-01008 processing when creating a job

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Today, dizzy and heavy to create a job, with Plsql graphical interface did not succeed, the SQL statement did not work, and finally found that the job variable is not defined, leave a pit here ...
Sql> begin
2 Sys.dbms_job.submit (Job =>: Job,
3 What => ' proc_export_containers; ',
4 next_date => to_date (' 01-04-2011 00:00:00 ', ' dd-mm-yyyy hh24:mi:ss '),
5 interval => ' trunc (sysdate) +1+0/24 ');
6 commit;
7 End;
8/

Begin
Sys.dbms_job.submit (Job =>: Job,
What => ' proc_export_containers; ',
Next_date => to_date (' 01-04-2011 00:00:00 ', ' dd-mm-yyyy hh24:mi:ss '),
Interval => ' trunc (sysdate) +1+0/24 ');
Commit
End

Ora-01008:not All variables bound

sql> variable job number;
Sql>
Sql> begin
2 Sys.dbms_job.submit (Job =>: Job,
3 What => ' proc_export_containers; ',
4 next_date => to_date (' 01-04-2011 00:00:00 ', ' dd-mm-yyyy hh24:mi:ss '),
5 interval => ' trunc (sysdate) +1+0/24 ');
6 commit;
7 End;
8/

Pl/sql procedure successfully completed
Job
---------
181

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