Woocommerce booking calendar keep spinning endlessly

I’m using WooCommerce and WooCommerce Bookings on my WordPress site but am having significant issues with the calendar not loading but just ‘spinning’ and so customers can’t choose a date to book. Purging the cache solves it temporarily, but then it comes back. Can anyone recommend a solution please?

[calendar not loading but just ‘spinning’](https://i.stack.imgur.com/6CFKL.png)
[Error](https://i.stack.imgur.com/Z2QUC.png)

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