fix error text bug

plugin.rb

@@ -45,22 +45,6 @@ def after_authenticate(auth_token)
   end
 
   def register_middleware(omniauth)
-    #Override OmniAuth on_failure in order to include error_description on redirect.
-    OmniAuth.config.on_failure = Proc.new { |env|
-      message_key = env['omniauth.error.type']
-      error_description = Rack::Utils.escape(env['omniauth.error'].error_reason)
-      new_path = "#{env['SCRIPT_NAME']}#{OmniAuth.config.path_prefix}/failure?message=#{message_key}&error_description=#{error_description}"
-      Rack::Response.new(['302 Moved'], 302, 'Location' => new_path).finish
-    }
-
-    #Override OmniauthCallbacksController.failure in order to show error_description
-    Users::OmniauthCallbacksController.class_eval do
-      def failure
-        flash[:error] = params[:error_description] || I18n.t("login.omniauth_error")
-        render layout: 'no_ember'
-      end
-    end
-
     omniauth.provider :auth0,
           :setup => lambda { |env|
             strategy = env["omniauth.strategy"]