Broked up my debugger and i'm getting this error being showm

Uncaught ReferenceError: $ is not defined
<anonymous> https://iowatrapperstalk.com/ubb_js/ubb_jslib.js:354

which is this code
Code
$(document).ready(function () {
	var to = "fas fa-plus-square fa-fw";
	var tc = "fas fa-minus-square fa-fw";
	$('div.expheader').each(function () {
		var state = false,
			answer = $(this).next('div'),
			ind = $(this).find('i');
		$(this).click(function () {
			state = !state;
			newSrc = (state) ? tc : to;
			ind.attr('class', newSrc);
			answer.slideToggle('fast');
		});
	});
});