ncaught TypeError: Cannot read property 'add' of null at Slick.initADA (slick.js:1307) at Slick.init (slick.js:1288) at new Slick (slick.js:183) at n.fn.init.$.fn.slick (slick.js:3003) at (index):1290 code example

$(".slider").not('.slick-initialized').slick()