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Hi I am relatively new to zk while running my project i am getting this error:

SEVERE: [Desktop z_6cx:/WEB-INF/jsp/app/page/header.zul] client error: Failed to mount: Cannot read properties of null (reading 'add')

Complete stack trace is:

zk.wpd:20 Uncaught TypeError: Cannot read properties of null (reading 'add')     at e.initADA (VM410 slick.min.js:1:19335)     at e.init (VM410 slick.min.js:1:19101)     at new <anonymous> (VM410 slick.min.js:1:2832)     at i.fn.slick (VM410 slick.min.js:1:42781)     at enableSlick (eval at <anonymous> (zk.wpd:8:5531), <anonymous>:12:42)     at x.content [as _content] (eval at c.evalJSON (zk.wpd:24:1726), <anonymous>:65:9)     at zul.utl.wpd:2:1141     at r (zk.wpd:20:2897)     at f (zk.wpd:20:2835)     at q (zk.wpd:20:2800)

can anyone help me please. Thankyou.

Hi I am relatively new to zk while running my project i am getting this error:

SEVERE: [Desktop z_6cx:/WEB-INF/jsp/app/page/header.zul] client error: Failed to mount: Cannot read properties of null (reading 'add')

Complete stack trace is:

zk.wpd:20 Uncaught TypeError: Cannot read properties of null (reading 'add')
    at e.initADA (VM410 slick.min.js:1:19335)
    at e.init (VM410 slick.min.js:1:19101)
    at new <anonymous> (VM410 slick.min.js:1:2832)
    at i.fn.slick (VM410 slick.min.js:1:42781)
    at enableSlick (eval at <anonymous> (zk.wpd:8:5531), <anonymous>:12:42)
    at x.content [as _content] (eval at c.evalJSON (zk.wpd:24:1726), <anonymous>:65:9)
    at zul.utl.wpd:2:1141
    at r (zk.wpd:20:2897)
    at f (zk.wpd:20:2835)
    at q (zk.wpd:20:2800)
(zk.wpd:20:2800)