twrp won't mount internal sdcard

My phone was just sitting on the charger and it reboooted while I was away from it. IT was sitting on the larger Samsung Galaxy S3 logo screen. I could not get the phone to boot. I went into TWRP and it took a much longer time to get into recovery mode. When I do, it says there is no OS! When I look in the log, this is what I see:

E: Could not mount /data and unable to find crypto footer
E: Unable to mount '/data'
E: Unable to recreate /data/media folder.
Updating partition details
E: Unable to mount '/system'
E: Unable to mount '/data'
E: Unable to mount '/cache'
E: Unable to mount internal storage
...