Hi Koha Discussion List, Introduction ============ My name is Curt Murley and I provide tech support for a small public library in Casco, ME USA. We are a long time Koha user starting with Koha 2.2 in 2007. Environment =========== Our production server is running Koha 20.05.18 installed from a Debian package on Debian Stretch. I have set up a new backup server running Debian Buster using the 20.05.x Debian package and loaded it using a mysqldump from the production server. With the exception of catalog searches the backup server seems to run fine, however the catalog cannot be searched. Problem ======= When I try to rebuild the zebra indices using #/sbin/koha-rebuild-zebra -f -v -b cpl (cpl is the instance name) I get the following error and of course the Zebra biblios indices are not rebuilt. I get the same error for authorities but the authorities indices are rebuilt. Error ===== Zebra configuration information ================================ Zebra biblio directory = /var/lib/koha/cpl/biblios Zebra authorities directory = /var/lib/koha/cpl/authorities Koha directory = /usr/share/koha/intranet/cgi-bin Lockfile = /var/lock/koha/cpl/rebuild/rebuild..LCK Use of uninitialized value $biblionumbertagfield in concatenation (.) or string at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 219. Use of uninitialized value $biblionumbertagsubfield in concatenation (.) or string at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 219. BIBLIONUMBER in : $ Use of uninitialized value $biblioitemnumbertagfield in concatenation (.) or string at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 220. Use of uninitialized value $biblioitemnumbertagsubfield in concatenation (.) or string at /usr/share/koha/bin/migration_tools/rebuild_zebra.pl line 220. BIBLIOITEMNUMBER in : $ ================================ Then for every biblionumber exported the following error occurs: error retrieving biblio N at /usr/share/koha/bin/migration_tools/ rebuild_zebra.pl line 681 Additional Information ====================== 1) I have checked that both kohafield='biblio.biblionumber' and kohafield='biblioitems.biblioitemnumber' have the correct values in the marc_subfield_structure table for all the framework codes in the cpl instance, i.e. 999c and 999d. 2) I have checked the cpl Koha logs in /var/log/koha/cpl and found nothing that will help me solve this problem. Question ======== Does anyone have any ideas how to fix this?