strange 406 Not Acceptable on redirect after update

after record create , the redirect to admins_partners_url is working fine ( :index displaying the page) but after the update , the record update is performed , but I get this error

.......`updated_at` = '2012-01-18 14:57:08' WHERE `partners`.`id` = 7    (10.1ms) COMMIT Redirected to http://lvh.me:3000/admins/partners Completed 406 Not Acceptable

same url... on create and update

  def create     @partner = Partner.new(params[:partner])     if @partner.save       flash.now[:notice] = t(:partner_added)       redirect_to admins_partners_url

  def update     @partner = Partner.find(params[:id])     respond_to do |format|       if @partner.update_attributes(params[:partner])         flash.now[:notice] = t(:partner_updated)         redirect_to admins_partners_url

I don't get it ...

[SOLVED] sorry for posting too fast ... pasting my code , I just noticed that I had a respond_to do |format| block in my update code ..... removing it did the trick !

I don't understand yet why .. but I'll do some search about it ....