Dear All, After upgrading from koha 3 to koha 22 I am facing this problem. When clicking on the checkout link and giving the cardnumber K am getting this 500 error message and on log I found this message. Template process failed: undef error - DBIx::Class::Storage::DBI::_dbh_execute(): DBI Exception: DBD::mysql::st execute failed: Unknown column 'me.id' in 'field list' at /usr/share/koha/lib/Koha/Objects.pm line 394: /usr/share/koha/intranet/cgi-bin/circ/circulation.pl, referer: ... circulation.pl The same error happens in members page alsoalso. In the home page Patrons Link is not available. I have been using this system without any problems since 2016. I can't figure what this me.id links to. Any help in this regard would be appreciated. Thank you Regards Dr. Liny Varghese University Library Cochin University of Science and Technology Kochi-22, Kerala