Datapump from procedure

I am wanting to do a datapump from a procedure. Ever time i run my procedure i get a error that says "job does not exist" From what i read online i thougt i could set my procedure up like this but i guess i cant. Thanks for the help
PROCEDURE "NIGHTLY_SCHEMA_EXPORT" AS
l_dp_handle NUMBER;
l_last_job_state varchar2(30) := 'UNDEFINED';
l_job_state varchar2(30) := 'UNDEFINED';
l_sts KU$_STATUS;
begin
l_dp_handle := DBMS_DATAPUMP.OPEN(
operation => 'EXPORT',
job_mode => 'SCHEMA',
remote_link => NULL,
job_name => 'EMP_EXPORT',
version => 'LATEST');
DBMS_DATAPUMP.add_file(
handle => l_dp_handle,
filename => 'NIGHTLY_SCHEMA_EXPORT.DMP',
directory => 'WRITABLE_DIRECTORY');
DBMS_DATAPUMP.metadata_filter(
handle => l_dp_handle,
name => 'SCHEMA_EXPR',
value => '=''VFT''');
DBMS_DATAPUMP.start_job(l_dp_handle);
DBMS_DATAPUMP.detach(l_dp_handle);
end;
This is the complete error that i am getting
ORA-31626: job does not exist
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79
ORA-06512: at "SYS.DBMS_DATAPUMP", line 911
ORA-06512: at "SYS.DBMS_DATAPUMP", line 4356
ORA-06512: at "DALLAS.NIGHTLY_SCHEMA_EXPORT", line 8
ORA-06512: at line 2

I have the same problem with a similar job:
declare
n_handle number;
begin
n_handle := dbms_datapump.open('EXPORT','SCHEMA',NULL,'REFRESH KONLOG','VALID');
end;
the error message is:
[1]: (Error): ORA-31626: job does not exist ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79 ORA-06512: at "SYS.DBMS_DATAPUMP", line 820 ORA-06512: at "SYS.DBMS_DATAPUMP", line 3742 ORA-06512: at line 4
any ideas thanks in advance
Andreas

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>
We have requirement to get the results from procedure usind JDBC callable statement call.
>
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