Trying to purchase the game through the in-app purchase
Every time, I get one of two error messages
This morning, I kept getting the error message "Unable to connect to iTunes Store"

A few hours later, on a new wi-fi connection, I got a new error (It's in the screenshots)

I've tried re-installing the app twice, to no avail.

Halp

Screenshots:
The 'confirm purchase' screen:

After hitting 'Buy'