[Koha] koha migration, simple view

Hello, we have migrated a Koha 18.11 to a new server following these instructions: http://kohageek.blogspot.com/2015/08/move-old-koha-database-to-new.html Everything looks and works fine, only the description (normal view) of the books is not displayed. I could not find anything in the logs. At which point do I have to search? Many greetings