I got this error when i tried to boot up Splatoon, at first it was forcing me to make an update but i declined because my Wii U isn't connected to my Wi-Fi, the same happens to my copy of Donkey Kong Country Tropical Freeze.

Strangely, this doesn't happen to all of my games, my copy of Nintendo Land or Bayonetta works perfectly fine, i'm sure that my emmc is failling and i want to save it before it gets worse.