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Hi,
Have you referred to the JKanban integration here https://preview.keenthemes.com/metronic8/demo1/documentation/general/jkanban/overview.html and included all the required CSS/js files?
Each example has its own JS code to initialize it:
https://preview.keenthemes.com/metronic8/demo1/documentation/general/jkanban/basic.html
Also, can u check if your console if jkanban JS is loading properly?
Regards.