to fix it you need to delete splatoon's shared data evertime you wanna go online sadly.

If you go into the lobby and get an error 104- something and if you are using inkay on a modded wii u, the fix is with a file called nimble.rpx. look up a fix to the error code on youtube and it'll give you the details on the fix.

Adding the nimble file is the solution. It should also turn on the miiverse posts for the Wii U Menu

you need to add a file into your sd card

you can find the link to the file's GitHub on the installation guide on pretendo.network.

how do you delete the shared data?

I did this, and nothing changed. Also, I already have the nimble.rpx, as that's how I am posting right now. But thank you all for the help!