This error can happen when the computer lost power wile 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
If you Can't see the files or folders, download the attached file and execute it.
The problem should be gone... If not, contact Support.