I really need to get it going ASAP. Maby can I try the other version 1.5 - 2.5?

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I´ve upgraded Joomla to Version 2.5.9. It´s still not working properly.

I get a lot of errors.
Fatal error: Call to a member function format() on a non-object in /mnt/web5/d2/57/52552757/htdocs/buchungsmaschine/administrator/components/com_booking/helpers/booking.php on line 945

Whats the problem?

Hey! I´ve bought the booking tool and when I want to istall it I´ll get the following error.

Fatal error: Class 'JModelLegacy' not found in /mnt/web5/d2/57/52552757/htdocs/buchungsmaschine/administrator/components/com_booking/helpers/model.php on line 20

What could be the problem?

Here the link to my website
www.online-buchungsmaschine.de