FileEntry-PathProcessingFailed]: Failed to process path

Why does this error occur? Vivaldi Browser constantly creates new files “Session_ *” and “Tabs_”. For a user it looks like the browser deletes the old file and creates a new file (with different number in file name). Why not just make a backup of a new file? In the settings it is indicated that you need to back-up folder "C: \ Vivaldi \ User Data \ Default \ Sessions ". What is the problem?

Warnings 2

  • 2021-10-23 00:37:21 +03 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Vivaldi\User Data\Default\Sessions\Session_13279412240358126
  • 2021-10-23 00:37:21 +03 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Vivaldi\User Data\Default\Sessions\Tabs_13279411535351971

At the time of these warnings during a backup, files with specified names no longer exist in the folder.

Capture2

Please look at server live log at About → Show log → Live → Warning which will probably answer that.