This error can happen when the computer lost power while it was writing files.

You can fix it by the following:

Go to C:\Users\<your account>\AppData\Roaming\HRDLLC\HRD Logbook\

Delete the 3 .TXT files, the .ZIP file and if exists the LogbookBackupSettings.XML

Start logbook.

If you Can't see the files or folders, download the attached file and execute it as Administrator.

(Right Click > Run as Administrator)

The problem should be gone... If not, contact Support.