I rooted, installed a custom recovery and CM11 no problems. My girlfriends however, is a different story.
I used odin to push Philz, used Philz to install SuperSU and KnoxRemover. Used GooManager to install TWRP 2.7.
Now when trying to Wipe/Install, this is what I get inside TWRP or CWM.
E: Unable to mount /data/media during GUI startup
E: Unable to mount /cache
Full SELinux support is present
It also says no OS is installed, but boots perfectly fine.
What is exactly going on here?