This is all I can see. I create a superadmin account for ARTIO and sent info by email, can you please take a look? This is for a production site due for launch by the end of this month. You should be able to replicate the 500 error by simply logging into the frontend and clicking "reservations". You can see the user error by trying to make a reservation or create a customer on the backend...

Hello,

Where did you send that email? We didn't receive anything from your registration email.
Can you send it to Diese E-Mail-Adresse ist gegen Spambots geschützt! Du musst JavaScript aktivieren, damit Du sie sehen kannst. ?

Please, add there also link to this topic.