Jquery - is not a function Issues

I am using Jquery

https://code.jquery.com/jquery-1.12.2.min.js

Then i include my function file,which has this function

;(function($){  
$.fn.UPLOAD_IMAGES= function(options) {
var defaults = { 
main_url         :  mainurl
};
var options = $.extend(defaults, options);
// retus the jQuery object to allow for chainability.  
      retu this;  
}  
})(jQuery);

Then I am calling it on click event like

   /*Image upload*/
      var options_img = {
         type: '',
         id: $('#id').val(),
         controller: 'listings'
             };
             $("#file_upload").UPLOAD_IMAGES(options_img);
        /*End image upload*/

It give me TypeError

UPLOAD_IMAGES is not a function

I do not know what i have missed?