TOPIC: Conflict with Event Gallery!?

I am using DT Regsister with succes for some time.

Now I try to install the Event Gallery Component but if I try to make my first Event Gallery if get a blank page. With Error Support set to Max I see this error on the blank page:

Fatal error: Cannot redeclare class TableEvent in /var/www/vhosts/13/104662/webspace/httpdocs/eindhovendanst.nl/administrator/components/com_dtregister/models/event.php on line 226

Doe anyone know what this means or better what to do to solve this? I do need a good Gallery Component and Event Gallery seem to be a nice choice.