I followed this guide to installing x64 bt5r3 encrypted and everything worked fine, then one day I booted and received the error "/dev/mapper/vg-root does not exist! Dropping to shell!"

I followed the troubleshooting steps at the end of the install guide to no avail. I have googled the issue and followed this guys suggestions as well which have not worked. Would this be because my drive is encrypted?

I have googled a number of miscellaneous ideas that came to mind and followed some shot-in-the-dark suggestions to no avail. Perhaps (hopefully) I am overlooking something simple.

Can anyone point me in the right direction or suggest some things I should look in to?