module ActiveAdmin::BaseController::Authorization

def rescue_active_admin_access_denied(exception)
  error = exception.message
  respond_to do |format|
    format.html do
      flash[:error] = error
      redirect_backwards_or_to_root
    end
    format.csv { render body: error, status: :unauthorized }
    format.json { render json: { error: error }, status: :unauthorized }
    format.xml { render xml: "<error>#{error}</error>", status: :unauthorized }
  end
end