Juxtaposition isn't available on SSSL.
To use Juxtaposition, install the Aroma custom firmware on your Wii U using the instructions at https://wiiu.hacks.guide. Then, once you've finished that, get Inkay installed with the instructions on https://pretendo.network/docs/install/wiiu and change your DNS settings to auto-obtain.
If you have any problems with modding your Wii U, you can get support on Nintendo Homebrew or GBAtemp.
For further support with this error code or any associated error codes, please look for a solution or make a support post on the forum.