I suspect that the error you are getting is because you have the 'Add Tags' box checked but you haven't configured Flac Frontend to use the tag.exe program. Just uncheck the tag box for now.

And use EAC for ripping. EAC EAC EAC. It's been said many times before. Don't use anything but EAC on a PC.

If it's not EAC, it's CRAP!