JQuery: $.get is not a function

This will happen, too, if you use the SLIM version of jQuery.

<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>

gave me

>jQuery.get
:undefined
>jQuery.get()
:VM7130:1 Uncaught TypeError: jQuery.get is not a function
    at <anonymous>:1:8

while loading the same library without the slim option

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>

works well

jQuery.get() :Object {readyState: 1}

The $ variable you have is from Prototype-js, because you are using the jQuery.noConflict method.

That method will restore the $ variable back to whichever library first implemented it.

You should use the jQuery methods on the jQuery global object directly, eg.:

jQuery.get(/* .. */);
jQuery.getJSON(/* .. */);
// etc...

Or you can define another shorter variable as alias if you want:

var $j = jQuery.noConflict();

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