[jQuery] [Validate] What is causing this error?

[Rick Faircloth]

I'm making another attempt to get Jorn's validation plug-in working.

I'm getting this error from Firebug after clicking in the first required field 
then out
(onfocusout):

validator.settings["on" + event.type].call is not a function
(function($) {$.extend($.fn,{validate:fun...cured when checking element 
"+element.id

Here's the code...where's my error?
(I'd love to show you an online example, but this is part of an Intranet app...)

Any help appreciated!

     $(document).ready(function() {

          $('#add-rental-property-form').validate({
        
               errorPlacement: function(error, element) {

               if(element.attr('id') == 'street_number') {
                  error.appendTo('#street-number-error');
               }

               else
                 
               if(element.attr('id') == 'street_name') {
                  error.appendTo('#street-name-error');
               }
                        
               else
                        
               if(element.attr('id') == 'city') {
                  error.appendTo('#city-error');
               }
                        
          },

          onsubmit: false,
                        
          onfocusout: true,
                        
          rules:    { street_number:  "required",
                      street_name:    "required",
                      city:           "required"
                    },

          messages:     { street_number:  required: "Please enter the property 
street number.",
                      street_name:    required: "Please enter the street name.",
                      city:           required: "Please enter the Years."
                        },

     })
});