Do you have a badfile.reminder in your Feralheart folder? If you do have a badfile.reminder, right-click that reminder file and click on "Open with" then select notepad, remove the file that the Badfile.reminder says inside it, and then you must delete the badfile.reminder and FH should start working again.
Skip the steps to removing the badfile.reminder if you don't have a badfile.reminder in your FH folder.