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I am trying to use devise from a Rails app to grant access to a Sinatra application within the Rack middleware. My config/routes.rb has: authenticate "admin" do mount Admins::Dashboard, :at => "/admins" end In my Sinatra app, I use: before do env["warden"].authenticate!(:scope => "admin") end get "/dashboard" do erb :dashboard end Now, I get an error with the following stacktrace: Started GET "/admins/dashboard" for 127.0.0.1 at 2012-10-11 08:45:13 +0200 NoMethodError (undefined method `failure_app' for nil:NilClass): devise (2.1.2) lib/devise/delegator.rb:11:in `failure_app' devise (2.1.2) lib/devise/delegator.rb:5:in `call' warden (1.2.1) lib/warden/manager.rb:130:in `call_failure_app' warden (1.2.1) lib/warden/manager.rb:116:in `process_unauthenticated' warden (1.2.1) lib/warden/manager.rb:47:in `call' actionpack (3.2.8) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' rack (1.4.1) lib/rack/etag.rb:23:in `call' rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'

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