Znuny Open Source Ticketsystem

Hello, I am trying to upgrade OTRS from 5.0.23 to 6.0.1, and I am getting the following error message: Step 10 of 37: Migrating ticket storage configuration ... [Mon Dec 4 15:16:42 2017] DBUpdate-to-6.pl: Use of uninitialized value $DefaultSetting{"Name"} in concatenation (.) or string at ...