Topic: Ajax validation not working

hello!

im just wondering why i keep on getting this all the time...

try {
new Insertion.Bottom("item_list", "#<UserItemQuantity:0x466fbbc>");
} catch (e) { alert('RJS error:\n\n' + e.toString()); alert('new Insertion.Bottom(\"item_list\", \"#<UserItemQuantity:0x466fbbc>\");'); throw e }

here is my code:
rhtml
<%= form_remote_tag(:url => {:action => 'create'})%>

controller
def create
    @item = UserItemQuantity.new(params[:user_item_quantities])

    if @item.save
      return if request.xhr?
    end
  end

create.rjs
if @item.new_record?
else 
  page.insert_html :bottom, 'item_list' , "#{@item}"
end


Please help me! I've tried everything and nothing worked. Thank you so much!