I couldn't use my preferred username so I threw a couple of numbers on the end and it seemed happy with that. I got the email with my password.
Once I logged in, I had set a nickname and select a car. I typed in my nickname and went with the left car. Then it threw this message
From then on it would only gve me this message
With nowhere to go, I quit out. So now I have no car, and the game crashes going places that need a car (field/tune up/items shop/car shop). Circuit race tells me "no selected car". Config tells me "no selected car" which seems weird that you need a car to change the screen or sound settings. The information screens except my car seem to work.