No. The game is updated. And my internet connection works. (Im posting with it)Can you connect to the internet properly? I think you have to update Splatoon, but you can't update the game so you get an error code.
My update data is broken. Its 0kb. I cant remove it. How can i proceed?Look here. According to this, your problem lies in your network connection. Make sure your Wii U can connect to the internet fine. Everything else in your house might work, except your Wii U for some reason.