if devise_cas_authenticatable is an engine dependency used by an api-only wbappapp (i.e. no need of secret_key) happens that logger is undefined
/Users/mario/.rvm/gems/ruby-2.2.3@support/gems/devise_cas_authenticatable-1.7.0/lib/devise_cas_authenticatable/routes.rb:24:in `raise_no_secret_key': undefined local variable or method `logger' for #<ActionDispatch::Routing::Mapper:0x007fde1c2af5b0> (NameError)
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/devise-3.5.3/lib/devise/rails/routes.rb:223:in `devise_for'
from /Volumes/storage/dev/application/api_engine_commons/config/routes.rb:3:in `block in <top (required)>'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:601:in `instance_exec'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:601:in `block in with_default_scope'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:816:in `scope'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/mapper.rb:600:in `with_default_scope'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:421:in `eval_block'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:401:in `draw'
from /Volumes/storage/dev/application/api_engine_commons/config/routes.rb:1:in `<top (required)>'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `each'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application.rb:169:in `reload_routes!'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/devise-3.5.3/lib/devise/rails.rb:14:in `block in <class:Engine>'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `call'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `each'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application/finisher.rb:55:in `block in <module:Finisher>'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:345:in `each'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:345:in `call'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
from /Users/mario/.rvm/rubies/ruby-2.2.3/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
from /Volumes/storage/dev/application/support/config/environment.rb:5:in `<top (required)>'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/application.rb:328:in `require_environment!'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:142:in `require_application_and_environment!'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:67:in `console'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/mario/.rvm/gems/ruby-2.2.3@support/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:8:in `require'
from bin/rails:8:in `<main>'
if devise_cas_authenticatable is an engine dependency used by an api-only wbappapp (i.e. no need of secret_key) happens that logger is undefined