According to the Nintendo Network status page, both Wii U and 3DS online services are experiencing some problems at the moment. I'd suggesting waiting a few hours until that page shows that things are back to normal and trying again. If it still doesn't work after that, then ask again.
I just tried to access the Dream Suite in Animal Crossing New Leaf and got that same error code!
Glad to know the problem is on Nintendo's end and not my new router.
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Topic: Error code 101-0112
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