some error message

Hi,

chrome console display some message :
https://upload.cc/i1/2019/07/22/sqfoiu.png

Uncaught TypeError: $(…).unslider is not a function
at brcs_generate_slider (suggestions.js:5)
at HTMLDocument.<anonymous> (suggestions.js:12)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at Function.ready (jquery.js:2)
at HTMLDocument.J (jquery.js:2)

please fix it.
Thank you very much.