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. -- View this message in context: http://www.nabble.com/Errors-occured-during-updating-koha-22-to-30-tp1888699... Sent from the Koha - Discuss mailing list archive at Nabble.com.