How do I deal with the error 'Preparing file list'?
There are a few users who encountered this issue, but no solution was provided. I recommend opening a ticket on the support page provided by the developer.
Support platform: http://support.codesector.com/index.php?/Tickets/Submit
Additionally, remove the application and reinstall it. This should fix most of the problems with the application. I am using this for a few years and haven't had any issues with it.