A software update is now available that fixes a specific error. We sincerely apologise for any inconvenience.
Please start the game while your Wii U console is connected to the Internet to update the software. The software version after this update will be 1.1.0, as shown in the image below.
If you have encountered this issue, downloading this update will allow you to continue with the game as normal.
Even with software purchased after the update was released, you will be required to download and install the latest update accordingly using the above method.