fancybox bug?

Question

JavaScript

There is a site on Bitrix, it has a gallery on fancybox It gives an
error "Uncaught TypeError: Cannot read property '$slides' of undefined"
How to find the reason?

Answer 1

move the init script down

Answer 2

99% - proger handler
The script does not need to be transferred anywhere, it must be connected correctly
. To check my words, uncheck the box "Combine scripts" and the checkbox "Move all scripts to the basement"
If after that the error disappears, then the proger handler.
You ask - how to connect it correctly?
google more intensively, but better take the course https://academy.1c-bitrix.ru/training/course/
When you get just such a piece of paper, all issues will be resolved faster...
There was some sarcasm - why? Because that's how you asked your question.
In decent establishments, they also show a screen of the error or a piece of code.