Javascript Errors Salient

There is some errors showing in the Javascript console when loading the homepage. Due to the presence of these errors, the page is not loading properly. The active theme of the wordpress site is Salient and the page builder is WPBakery page builder.
The list of the errors are as below:

Uncaught TypeError: Cannot read property ‘indexOf’ of undefined
at /wp-content/themes/salient/js/jquery.twentytwenty.js?ver=1.0:580

Uncaught TypeError: $that.twentytwenty is not a function
at ImagesLoaded.<anonymous> (/wp-content/themes/salient/js/init.js?ver=10.0.1:1587)
at ImagesLoaded.proto.emitEvent (/wp-content/themes/salient/js/flickity.min.js?ver=2.1.2:254)
at ImagesLoaded.complete (/wp-content/themes/salient/js/flickity.min.js?ver=2.1.2:4526)
at ImagesLoaded.progress (/wp-content/themes/salient/js/flickity.min.js?ver=2.1.2:4514)

Uncaught TypeError: a.indexOf is not a function
at r.fn.init.r.fn.load (https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js:4)
at HTMLDocument.<anonymous> (https://www.encore-can.com/wp-content/themes/salient/js/init.js?ver=10.0.1:12130)
at j (https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js:2)
at k (https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js:2)
at HTMLDivElement.<anonymous> (/wp-content/themes/salient/js/nectar-slider.js?ver=10.0.1:3779)
at Function.each (https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js:2)
at r.fn.init.each (https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js:2)
at initialSlideLoad (/wp-content/themes/salient/js/nectar-slider.js?ver=10.0.1:3661)
at HTMLDocument.<anonymous> (/wp-content/themes/salient/js/nectar-slider.js?ver=10.0.1:3898)

I have searched all the files to see the source of the errors. Since i don’t have much experience with the theme and the builder, i couldn’t find what causing the issues. When i have searched with the errors, what i can know is updating the theme and builder will solve the issue.

Please someone help me to resolve this issue asap. Thanks in advance.