This is the result:
No broken filesets found in database, checking for missing remote files
Listing remote folder ...
ignoring remote file listed as Deleted: duplicati-20180219T050028Z.dlist.zip.aes
ignoring remote file listed as Deleted: duplicati-20180219T175110Z.dlist.zip.aes
Marked 3 remote files for deletion
Found 29 broken filesets with 485 affected files, purging files
Purging 87 file(s) from fileset 20.5.2018 6:29:06
Starting purge operation
Replacing fileset duplicati-20180520T032906Z.dlist.zip.aes with duplicati-20180520T032907Z.dlist.zip.aes which has with 87 fewer file(s) (64,19 MT reduction)
System.Exception: Unexpected number of remote volumes marked as deleted. Found 1 filesets, but 0 volumes
at Duplicati.Library.Main.Database.LocalDeleteDatabase+<DropFilesetsFromTable>d__5.MoveNext () <0x41ce9e80 + 0x007f7> in <filename unknown>:0
at System.Linq.Buffer`1[TElement]..ctor (IEnumerable`1 source) <0x41ce98f0 + 0x00273> in <filename unknown>:0
at System.Linq.Enumerable.ToArray[TSource] (IEnumerable`1 source) <0x41ce9870 + 0x0002f> in <filename unknown>:0
at Duplicati.Library.Main.Operation.PurgeFilesHandler.DoRun (Duplicati.Library.Main.Database.LocalPurgeDatabase db, IFilter filter, System.Action`3 filtercommand, Single pgoffset, Single pgspan) <0x41cd4a30 + 0x015bb> in <filename unknown>:0
at Duplicati.Library.Main.Operation.PurgeFilesHandler.Run (Duplicati.Library.Main.Database.LocalPurgeDatabase db, Single pgoffset, Single pgspan, System.Action`3 filtercommand) <0x41cd49d0 + 0x0004f> in <filename unknown>:0
at Duplicati.Library.Main.Operation.PurgeBrokenFilesHandler.Run (IFilter filter) <0x41c949e0 + 0x01ba3> in <filename unknown>:0
at Duplicati.Library.Main.Controller+<>c__DisplayClass39_0.<PurgeBrokenFiles>b__0 (Duplicati.Library.Main.PurgeBrokenFilesResults result) <0x41c947a0 + 0x0006f> in <filename unknown>:0
at Duplicati.Library.Main.Controller.RunAction[T] (Duplicati.Library.Main.T result, System.String[]& paths, IFilter& filter, System.Action`1 method) <0x41c2efc0 + 0x0022f> in <filename unknown>:0
What now?