Duplicati 2.0.2.9 won’t start

Support
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Hi, i removed duplicates, deleted all the folders and then i reinstalled it.
Now it starts correctly but the problems that i had with the 2.0.2.8 version remain.
In addition now in the “Backup destination, Folder path” does not accept network paths, for example \\NAS\Test\ and i have the following error:

Fatal error
System.ArgumentException: L'oggetto deve essere una directory radice ("C:\") o una lettera di unità ("C").
   in System.IO.DriveInfo..ctor(String driveName)
   in Duplicati.Library.Backend.File.GetDrive()
   in Duplicati.Library.Backend.File.get_Quota()
   in Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
   in Duplicati.Library.Main.Operation.FilelistProcessor.VerifyRemoteList(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
   in Duplicati.Library.Main.Operation.BackupHandler.PreBackupVerify(BackendManager backend, String protectedfile)
   in Duplicati.Library.Main.Operation.BackupHandler.Run(String[] sources, IFilter filter)