No stars, not happy

Used this for the first time today. After putting all my information in and confirming the machine was the right number as the one on Whoosh! I received an "Oops, error occurred." I had no confirmation that the transaction was complete and no ticket printed. I then paid at the machine just using my card and my ticket printed. Whoosh! Charged me for the park - Double paying for parking is crap. Just stupid. Wont be using this app again.

Krs13682 about Whoosh!, v1.21