Bus booking plugin wordpress problem

Hi !

I will try to explain my problem synthetically, I am currently creating a bus ticket booking site for a customer. I use the “**Bus Ticket Booking with Seat Reservation**” plugin. However, I encounter some problems.

1- on the home page I put a booking form with the following shortcode “[wbtm-bus-search-form]”, however when we choose our city and press “search buses”, we get on the page “bus-search-list ” but the result of the search is not displayed, I have a blank page.

To give you an idea of ??the problem here is the link of the site:https://webcrea74test.onlinewebshop.net/

I think the problem is located in the file “wbtm_shortcode.php” plugin but I have knowledge limit in code and I do not know what to do for the results of the search is displayed.

Would someone have an idea to solve my problem, because it’s been 2 days that I’m blocking and I’m desperate. Thank you in advance

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