error TypeError: $(…).datetimepicker is not a function

I get this error in my site when I try to choose date.
What it’s weird is that this product module is added as a visual composer module. If I see original product page, datepicker works perfectly. see the difference:
http://www.barcelonacyclingcenter.com/tours/forat-del-vent-y-tibidabo/
(here it doesn’t work, I get error)

http://www.barcelonacyclingcenter.com/shop/uncategorized/test-dani/
(here it works fine)

It’s same product!
Please help!

https://ww.wp.xz.cn/plugins/wc-fields-factory/