Error: Cannot read data while writing

Error: System.Exception: Cannot read data while writing
   at Duplicati.Library.Compression.FileArchiveZip.FileExists(String file)
   at Duplicati.Library.Main.RSync.RSyncDir..ctor(String[] sourcefolder, CommunicationStatistics stat, FilenameFilter filter, List`1 patches)
   at Duplicati.Library.Main.Interface.Backup(String[] sources)
   at Duplicati.GUI.DuplicatiRunner.ExecuteTask(IDuplicityTask task)
Cleanup output: