error: n.imagesLoaded is not a function

I have converted a template to wordpress format. and added styles and scripts in functions.php. but i keep getting error snow.min.js:11 Uncaught TypeError: n.imagesLoaded is not a function at HTMLDivElement.<anonymous> (snow.min.js:11) at Function.each (jquery.min.js:2) at w.fn.init.each (jquery.min.js:2) at e.t.initPluginIsotope (snow.min.js:11) at e.value (snow.min.js:11) at e.value (snow.min.js:11) at Object.<anonymous> (snow-init.js:154) at __webpack_require__ (snow-init.js:30) at Object.<anonymous> (snow-init.js:140)…

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