Rails - Oct 2013 - ActionController::UnknownFormat when using respond_to do |format|

I am using jquery slider ui and rails 4. I am trying to implement a price 
slider for my product page. However, i have run into a problem. I have 
tried to search around but i cant seems to find a solution that helps. Hope 
someone could help me as I am quite new to ruby on rails. Thanks.

Here are my code

products_controller.rb

 respond_to do |format|
  format.js do
    render :update do |page|
      page.replace_html ''x_product_list'', :partial =>
''products/products_list'', :locals => { :product =>
@product }

with this error:

ActionController::UnknownFormat

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On 5 October 2013 18:09, 
<sadocean-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I am using jquery slider ui and rails 4. I am trying to implement a price
> slider for my product page. However, i have run into a problem. I have
tried
> to search around but i cant seems to find a solution that helps. Hope
> someone could help me as I am quite new to ruby on rails. Thanks.
>
> Here are my code
>
> products_controller.rb
>
>  respond_to do |format|
>   format.js do
>     render :update do |page|
>       page.replace_html ''x_product_list'', :partial =>
> ''products/products_list'', :locals => { :product =>
@product }
>
> with this error:
>
> ActionController::UnknownFormat
You have not really given us enough information.  Show us the contents
of the log for the request.

Colin

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