Dbms_lob.copy ORA=21560 ORA-21560: argument 3 is null, invalid, or out of

Question

I am trying to download a blob from a database table and I am getting ORA-21560: argument 3 is null, invalid, or out of range
this is my code:
PROCEDURE retrieve_document (p_pk_id in varchar2)
IS
size1 integer;
blob1 BLOB ;
tmpblob BLOB;
l_mimetype varchar2(4000);
BEGIN
BEGIN
insert into temp_document
select pk_id,document_file,mime_type
from portal_documents
where pk_id = p_pk_id;
select document_file, mime_type
into blob1, l_mimetype
from temp_document;
--insert into temp_stu_pic select student_id, student_picture from stu_pics
where student_id = 'CHS321';
--select student_picture into blob1 from temp_stu_pic where student_id = 'CHS321';
EXCEPTION when no_data_found then null;
END;
size1 := dbms_lob.getlength(blob1);
dbms_lob.createtemporary(tmpblob,true);
dbms_lob.copy(tmpblob,blob1,size1,1,1);
owa_util.mime_header(l_mimetype, false,null);
htp.p('Content-length: '|| size1);
htp.p('Pragma: no-cache');
htp.p('Cache-Control: no-cache');
htp.p('Expires: Thu, 01 Jan 1970 12:00:00
GMT');
owa_util.http_header_close;
wpg_docload.download_file(tmpblob);
dbms_lob.freetemporary(tmpblob);
END retrieve_document;
Anybody know why I would be getting this error?

Answer 1

In the future, use the PRE and /PRE tags, enclosed in [] to format your code.
You have commented out some code, and left other portions.
If you're actually getting an error when running (which i would guess you are based on the thread title) then show us the copy / paste of the error message which shows line numbers, etc...
PROCEDURE retrieve_document (p_pk_id in varchar2)
IS
   size1 integer;
   blob1 BLOB ;
   tmpblob BLOB;
   l_mimetype varchar2(4000);
BEGIN
   BEGIN
   insert into temp_document
   select pk_id,document_file,mime_type
   from portal_documents
   where pk_id = p_pk_id;
   select document_file, mime_type
   into blob1, l_mimetype
from temp_document;
--insert into temp_stu_pic select student_id, student_picture from stu_pics
where student_id = 'CHS321';
   --select student_picture into blob1 from temp_stu_pic where student_id = 'CHS321';
   EXCEPTION when no_data_found then null;
   END;
   size1 := dbms_lob.getlength(blob1);
   dbms_lob.createtemporary(tmpblob,true);
   dbms_lob.copy(tmpblob,blob1,size1,1,1);
   owa_util.mime_header(l_mimetype, false,null);
   htp.p('Content-length: '|| size1);
   htp.p('Pragma: no-cache');
   htp.p('Cache-Control: no-cache');
   htp.p('Expires: Thu, 01 Jan 1970 12:00:00
   GMT');
   owa_util.http_header_close;
   wpg_docload.download_file(tmpblob);
   dbms_lob.freetemporary(tmpblob);
END retrieve_document;Message was edited by:
Tubby