AH01215: Failed to load Koha::Plugin::Com::ByWaterSolutions::PatronEmailer: Could not find or check module 'Koha::Plugin::Com::ByWaterSolutions::PatronEmailer' at /usr/share/koha/lib/Koha/Plugins.pm line 124.: /usr/share/koha/intranet/cgi-bin/circ/circulation.pl, there are no any plugin installed on this system, I cant send any emails using smtp.gmail.com with app password. /var/log/koha/library/intranet-error.log AH01215: Failed to load Koha::Plugin::Com::ByWaterSolutions::PatronEmailer: Could not find or check module 'Koha::Plugin::Com::ByWaterSolutions::PatronEmailer' at /usr/share/koha/lib/Koha/Plugins.pm line 124.: /usr/share/koha/intranet/cgi-bin/circ/circulation.pl,
Please double check that there haven't been any plugins installed present or in the past. Overall this reads more like a support request, that would be better suited for the mailing list or IRC chat.