Date and Time Picker Not Working

The date and time picker for Salon Booking is not working on the Cerla Salon theme:
https://themeforest.net/item/cerla-cosmetics-woocommerce-wordpress-theme/30930810

This does work on twenty twenty one theme, so appreciate this is a theme issue, but I am struggling to diagnose.

Nothing shows in console, but the below shows once you click next (with the default date and time)

TypeError: undefined is not an object (evaluating ‘$(“#sln-step-submit”).data(“salon-toggle”).length’)

I have tried removing any JS files from the theme but this doesn’t seem to sort.