I upgraded to Windows 10, and Lightroom was working until now, and I first got the error "unexpected error opening Lightroom catalog." I applied the fix mentioned in the FAQs, namely using option two, to select the folder, right-click and change the settings to grant the user the permissions. However, I now get the new error message mentioned in the subject line. Any suggestions?
This is a new folder I created and have been working on it for the last couple of days, so I do not have a backup of the data.