SOLVED: Importing ebooks with special characters

[Shifter]

That's what I found in the logs:

Code:

[2024-05-13 16:08:46.708 +02:00] [INF] [10] Emby.Server.Implementations.IO.LibraryMonitor: "RandomHouse" ("/library/Bücher/RandomHouse") will be refreshed.
[2024-05-13 16:08:47.168 +02:00] [ERR] [15] MediaBrowser.Providers.Manager.ProviderManager: Error refreshing item
System.TypeInitializationException: The type initializer for 'ICU4N.Text.Transliterator' threw an exception.
---> System.TypeInitializationException: The type initializer for 'ICU4N.Globalization.UCultureInfo' threw an exception.
---> System.Globalization.CultureNotFoundException: Only the invariant culture is supported in globalization-invariant mode. See https://aka.ms/GlobalizationInvariantMode for more information. (Parameter 'name')
en is an invalid culture identifier.
  at System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride)
  at ICU4N.Globalization.UCultureInfo..cctor()