(Bricked?) Wii U After Memory Error
Sounds like a brick to me. Regardless as to whether the memory error is RAM-related or flash-related, it's not user-serviceable. You'll likely have to ship the WiiU back to Nintendo for repairs. Is there a specific error code displayed? According to their site, Nintendo is apparently aware of an issue like this and is asking anyone with the specific error codes 160-0103 and 160-1710 to call them.
If, on the other hand, you're able to actually get the menu, then there may be hope. Indications that the issue can be caused by software overwriting save files are out there, and if you can get to any menu where you can choose a user, creating a new user may allow you to work around it. Check this Reddit thread for more info about that workaround (replace Smash Bros with whatever game was running prior to this happening if it wasn't Smash Bros, though by the sound of it, it's Smash Bros).

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