The error seems to have something to do with faulty flash memory.
An error code on certain Wii U systems are leaving some systems bricked, reports are circulating.
Error Code 160-0103 has popped up on certain systems, deleting save data and rendering games unplayable. A similar error code (160-1710) persists even in the data management menu, bricking the system. Those who are familiar with the situation note that it may be due to faulty flash memory within the Wii U system, though nothing is confirmed as of this writing.
While originally thought to be only found in Super Smash Bros. for Wii U, other games have had this problem as well, including Hyrule Warriors and Mario Kart 8. If you have experienced this error, please let us know in the feedback below!