unable to locate Koha configuration file koha-conf.xml at /usr/share/koha/lib/C4/Context.pm line 244.
Use of uninitialized value in concatenation (.) or string at /usr/share/koha/lib/C4/Templates.pm line 154.
Use of uninitialized value $db_name in concatenation (.) or string at /usr/share/koha/lib/Koha/Database.pm line 96.
Use of uninitialized value $db_host in concatenation (.) or string at /usr/share/koha/lib/Koha/Database.pm line 96.
DBD::mysql::db do failed: No database selected [for Statement "
            SELECT * FROM systempreferences WHERE 1 = 0 "] at /usr/share/koha/lib/Koha/Database.pm line 122.
DBD::mysql::st execute failed: No database selected [for Statement "SELECT `me`.`variable`, `me`.`value`, `me`.`options`, `me`.`explanation`, `me`.`type` FROM `systempreferences` `me` WHERE ( `me`.`variable` = ? )" with ParamValues: 0='casauthentication'] at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1836.
DBD::mysql::st execute failed: No database selected [for Statement "SELECT `me`.`variable`, `me`.`value`, `me`.`options`, `me`.`explanation`, `me`.`type` FROM `systempreferences` `me` WHERE ( `me`.`variable` = ? )" with ParamValues: 0='caslogout'] at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1836.
Use of uninitialized value in concatenation (.) or string at /usr/share/koha/lib/C4/Auth_with_cas.pm line 42.
DBD::mysql::st execute failed: No database selected [for Statement "SELECT `me`.`variable`, `me`.`value`, `me`.`options`, `me`.`explanation`, `me`.`type` FROM `systempreferences` `me` WHERE ( `me`.`variable` = ? )" with ParamValues: 0='casserverurl'] at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1836.
Use of uninitialized value $INC[-1] in string eq at /usr/share/koha/lib/Koha/Plugins.pm line 37.
Use of uninitialized value in require at (eval 1637) line 1.
Use of uninitialized value $_ in string ne at /usr/share/perl5/Net/DNS/RR.pm line 39.
Use of uninitialized value in require at (eval 1641) line 1.
Use of uninitialized value in require at (eval 1643) line 1.
DBD::mysql::st execute failed: No database selected [for Statement "SELECT `me`.`variable`, `me`.`value`, `me`.`options`, `me`.`explanation`, `me`.`type` FROM `systempreferences` `me` WHERE ( `me`.`variable` = ? )" with ParamValues: 0='cronjoblog'] at /usr/share/perl5/DBIx/Class/Storage/DBI.pm line 1836.
DBD::mysql::st execute failed: No database selected [for Statement "
        SELECT mq.message_id, mq.borrowernumber, mq.subject, mq.content, mq.message_transport_type, mq.status, mq.time_queued, mq.from_address, mq.reply_address, mq.to_address, mq.content_type, b.branchcode, mq.letter_code
        FROM message_queue mq
        LEFT JOIN borrowers b ON b.borrowernumber = mq.borrowernumber
        WHERE status = ?
    " with ParamValues: 0='pending'] at /usr/share/koha/lib/C4/Letters.pm line 1317.
Can't use an undefined value as an ARRAY reference at /usr/lib/x86_64-linux-gnu/perl5/5.30/DBI.pm line 2086.