update BLOB

Hello,
version oracle 112
I was testing the following script to update a blob-type column but it didn't work.


DECLARE
  l_bfile  BFILE;
  l_blob   BLOB;
BEGIN
  SELECT DOCUMENT_FILE
      INTO  l_blob
      FROM  table
     WHERE  SEQUENCE=12345 
     FOR UPDATE;
   l_bfile := BFILENAME  ('BACKUPS', TEXT.log');
  DBMS_LOB.fileopen(l_bfile, Dbms_Lob.File_Readonly);
  DBMS_LOB.loadfromfile(l_blob,l_bfile,DBMS_LOB.getlength(l_bfile));
  DBMS_LOB.fileclose(l_bfile);
   END;
/



ORA-01403: no data found
ORA-06512: en línea 5

Can you help me please telling me how I can achieve this?

Thanks.