JQuery: $.get is not a function

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();