Attendees unable to register

Hello,

I have recently downloaded the Event Calender Registration in my site.
I have configured as per the instruction and create new event with price/fee giving REG and selected order per 1 and configured event.

Whenever attendee trying to register they are getting issues as below

“You are registering for 0 person(s). Please provide the first and last name of each person:”

BACK

“You must select at least one registration item. Please go back and select an item!”

When i click back, there is nothing to select, all are filled and accurately, please visit clone1.c21.ae, try to register.

Looking for valuable support.

Thanks,
Sam.

The page I need help with: [log in to see the link]