Once the library is managed, when manually indicating the search for new content, the log shows the following error
[2019-08-11 11:29:27.009 +02:00] [ERR] Error in "Open Packaging Format"
System.NullReferenceException: Object reference not set to an instance of an object.
at Jellyfin.Plugin.Bookshelf.Providers.BookProviderFromOpf.ReadOpfData(MetadataResult`1 bookResult, String metaFile, CancellationToken cancellationToken)
at Jellyfin.Plugin.Bookshelf.Providers.BookProviderFromOpf.GetMetadata(ItemInfo info, IDirectoryService directoryService, CancellationToken cancellationToken)
at MediaBrowser.Providers.Manager.MetadataService`2.RefreshWithProviders(MetadataResult`1 metadata, TIdType id, MetadataRefreshOptions options, List`1 providers, ItemImageProvider imageService, CancellationToken cancellationToken)
Once the library is managed, when manually indicating the search for new content, the log shows the following error