TOPIC: Problem in Event Registration with javavalidate

Hello,

Sorry, but I am Spanish and i don't know speak English very well.
I have a problem with event registration page, in this show de next message:

"Notice: Undefined property: TableEvent::$javavalidation in /var/www/html/joomla25/administrator/components/com_dtregister/models/event.php on line 6412"

I prove to comment this line and then show error in the next line where show "this->javavalidate", because it appear in this line.

I have dt-register version 2.8.13a and i run it with php 5.5.9 and Mysql 5.5.38. i have ubuntu server.

Thank you very much.