[Rails] How to handle ActiveRecord::RecordInvalid

[Zeck]

I'm new to Rails. I'm using Service layer to keep my controllers thin. All 
my service layer files are located in app/services/domain, 
app/services/application and app/services/infrastructure. I'm using 
services in active admin controller section. When validation fail it can't 
redirect correctly, it keeps throwing me ActiveRecord::RecordInvalid. Here 
is the error page: 

<http://i.stack.imgur.com/YDiNN.png>

And here is the category service:

def self.create(params)
    ActiveRecord::Base.transaction do
        begin
            category = Category.new(params)
            decrease_counters(category.id)
            increase_counters(category.id)
                category.save!
        end
    end
end

In finally here is the my controller:

  controller do

    def create
      category = Service::CategoryService.create(params[:category])
      if category
        flash[:notice] = "Category was successfully created."
        redirect_to params[:button] == "create_and_new" ? 
new_admin_category_url : admin_categories_url
      else
        render active_admin_template('new.html.erb')
      end
    end
  end # end controller

How to solve it? Please help me.

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