Update: It seems that this error is not exclusive to just Super Smash Bros. (although many cases do involve the game) but is a general system bug that can show up in other games, such as Scribblenauts. Furthermore, the glitch has been around since launch but has become more widespread as more users have stumbled across it.
A mysterious error has appeared for those playing the physical version of Super Smash Bros. for Wii U. When some players booted up the game or went to the Data Management page on the Wii U, the error 160-0103 randomly occurred.
What’s worse is that no one, Nintendo included, knows what’s causing this error to occur. The general consensus is that the error originates from the game’s update data and not from the Wii U itself. The effects, however, are incredibly damaging as the bug can wipe all memory from your Wii U system and cause your system to brick if you try to reformat it afterwards.
Check out the video from Trippy12345ify below, which shows the pristine condition of his physical disc, and the error occurring despite it.