[Q] /data/media deleted, help? topic

So I was trying to install a cm12 nightly on my asus tf300t, but the lollipop gapps weren't working. In an attempt to fix something, I used the 'format data' feature in TWRP. Now whenever I try to flash something it fails and gives me an error to the tune of "unable to open /data/media, file not found."

Is there a fix for this? I had a backup, but I think it was on the partition that was formatted.