jQuery error for tours when trying to book

My tourWP site stopped working, I think its a JS code error in the

you did a custom plugin for deposits for me a while ago, so maybe the problem is with that?

I get this error from: https://grouptravel.gowithglow.com/?tb-ajax=add_tour_to_cart_phys

{“status”:”error”,”message”:”invalid tour”}

I also installed the jQuery migrator helper and it flagged an error with:

https://grouptravel.gowithglow.com/wp-content/plugins/travel-booking/assets/js/admin/booking.js

I have double checked all caching and other plugins to make sure its nothing else causing it. Can you help its urgent I can easily provide you with access. (wp & SFTP)

thanks

Matt.