[Koha] Create log4pearl.conf for old Koha instance?

Hello! I am getting the following message in the about page: "You are missing the <log4perl_conf> entry in your koha-conf.xml file. Please add it, pointing to the log4perl.conf file for your Koha instance." After a Google search I looked for the log4perl.conf file on my server... but I can't find it. Do I have to create it in any way? If not, Ijust need to add the following line in my /etc/koha/sites/INSTANCE/koha-conf.xml ? <log4perl_conf>/etc/koha/log4perl.conf</log4perl_conf> Thank you in advance... -- Koha: 17.05.02.000 Debian 8.9