empty message after registration

Hello,
after registration i am getting a system message: Attention: Empty message.
How can i remove this or make it meaningful?

Hi

I think there must be something wrong with your settings (maybe you have an empty message somewhere in Events Booking - usually email message) and it causes the error. In this case, could you please:

1. Submit a support ticket sending us admin and FTP account of your site.

2. Send me the link to registration page

I will check to see what's wrong and get it corrected for you

Regards,

Tuan