Recently had the same problem: TypeError: $(...).slick is not a function
Found an interesting solution. Hope, it might be useful to somebody.
In my particular situation there are: jQuery + WHMCS + slick. It works normal standalone, without WHMCS. But after the integration to WHMCS an error appears.
The solution was to use jQuery in noConflict mode.
Ex: Your code:
$(document).ready(function() {
$('a').click( function(event) {
$(this).hide();
event.preventDefault();
});
});
Code in noConflict mode:
var $jq = jQuery.noConflict();
$jq(document).ready(function() {
$jq('a').click( function(event) {
$jq(this).hide();
event.preventDefault();
});
});
The solution was found here: http://zenverse.net/jquery-how-to-fix-the-is-not-a-function-error-using-noconflict/