Why am I getting 'undefined is not a function' in chrome dev console?

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So I have a js script I'm running on my website, I have checked in chrome and all my libraries are importing, no errors there. Still I am getting the following error:

Uncaught TypeError: undefined is not a function   masonrydemo.js:4
(anonymous function)                              masonrydemo.js:4
j                                                 jquery.min.js:2
k.fireWith                                        jquery.min.js:2
n.extend.ready                                    jquery.min.js:2
I                                                 jquery.min.js:2

Here is my script (masonrydemo)

$(document).ready(function() {
  $('.container').masonry({
   itemSelector: '.grid_4'
  }).imagesLoaded(function() {
   $('.container').masonry('reload');
  });
});

The script appears to be working, so I'm not sure what that error means?

asked 40 secs ago

Dr. Donnaloia

74

Why am I getting 'undefined is not a function' in chrome dev console?