[Koha] Errors occured during updating koha 22 to 30

[Bobby703]

Hi all. I am on the way to koha 3.0 from 2.2. I followed the online
instruction of Upgrading from Koha 2.2 to Koha 3.0. I tried to update the
database which I really care about and I ran the following scripts

installer/data/mysql/update22to30.pl
DROP TABLE `auth_word` , `marc_word` ;
installer/data/mysql/updatedatabase.pl
misc/migration_tools/22_to_30/move_marc_to_biblioitems.pl
misc/migration_tools/22_to_30/move_marc_to_authheader.pl
misc/migration_tools/22_to_30/rebuild_unimarc_100.pl

They works fine, no serious errors. Some other errors are fixed by myself.
However, when I ran misc/migration_tools/22_to_30/missing090field.pl. There
was one error in my error log Tag "" is not a valid tag. at
missing090field.pl line 50
I checked the script and it seems to call GetMarcFromKohaField function and
does something with marc_subfield_structure table. I checked the table and
only found one record in the table. Then I check the old database for koha
2.0 and found lots of records in the table although the table structure is a
little bit different from current one. Did I miss records in
marc_subfield_structure? What is causing this error and how can I fix that?
Many thanks in advance. 




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