I tried messing around with my 3DS, but it doesn't seem to coming from my end. I've had a few trades today, and haven't had this issue. Maybe I could try resetting my router and try again? I'm not sure what else to do.
This is what I need, one of each, however I need 3 or 4 of the "donut cushion".
Do you have a list to what Harvey items you need? I'm not sure how you can come over now because of the error. My gate is open if you want to test it. If you don't have a list I could snapshot what Harvey has, show it to you like so (x), then time travel to the next day, and repeat. I have plenty of MEOW coupons so don't worry.
Or perhaps, we could try again another day and see what happens. It's likely only your connection.