spotify client failing - RestClient::Unauthorized (401 Unauthorized)

production.log

2017-02-02T01:36:31.954966+00:00 app[web.1]: F, [2017-02-02T01:36:31.954612 #21] FATAL -- : [367f4ad9-fbeb-4892-81ad-a76c9c7987c5]   
2017-02-02T01:36:31.954981+00:00 app[web.1]: F, [2017-02-02T01:36:31.954720 #21] FATAL -- : [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] RestClient::Unauthorized (401 Unauthorized):
2017-02-02T01:36:31.954982+00:00 app[web.1]: F, [2017-02-02T01:36:31.954759 #21] FATAL -- : [367f4ad9-fbeb-4892-81ad-a76c9c7987c5]   
2017-02-02T01:36:31.954982+00:00 app[web.1]: F, [2017-02-02T01:36:31.954795 #21] FATAL -- : [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] lib/apis/spotify_client.rb:5:in `top_tracks'
2017-02-02T01:36:31.954983+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] app/bot/postback.rb:122:in `onboard_listen_song'
2017-02-02T01:36:31.954984+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] app/bot/postback.rb:18:in `process'
2017-02-02T01:36:31.954985+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] app/bot/brain.rb:67:in `process_postback'
2017-02-02T01:36:31.954986+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] app/bot/brain.rb:49:in `process_message'
2017-02-02T01:36:31.954991+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] app/bot/listen.rb:11:in `block in <top (required)>'
2017-02-02T01:36:31.954992+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] lib/rack/fb_ping.rb:16:in `_call'
2017-02-02T01:36:31.954993+00:00 app[web.1]: [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] lib/rack/fb_ping.rb:11:in `call'
2017-02-02T01:36:31.955324+00:00 app[web.1]: D, [2017-02-02T01:36:31.954987 #21] DEBUG -- : [367f4ad9-fbeb-4892-81ad-a76c9c7987c5] Error occurred while parsing request parameters.
2017-02-02T01:36:31.955332+00:00 app[web.1]: Contents:
2017-02-02T01:36:31.955333+00:00 app[web.1]: 
2017-02-02T01:36:31.955334+00:00 app[web.1]: 
2017-02-02T01:36:31.955603+00:00 app[web.1]: Error during failsafe response: no implicit conversion of nil into String
2017-02-02T01:36:31.955604+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/parameters.rb:78:in `rescue in parse_formatted_parameters'
2017-02-02T01:36:31.955606+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/parameters.rb:72:in `parse_formatted_parameters'
2017-02-02T01:36:31.955606+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/request.rb:354:in `block in POST'
2017-02-02T01:36:31.955607+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch'
2017-02-02T01:36:31.955607+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch_header'
2017-02-02T01:36:31.955609+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/request.rb:353:in `POST'
2017-02-02T01:36:31.955609+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/parameters.rb:35:in `parameters'
2017-02-02T01:36:31.955610+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/mime_negotiation.rb:63:in `block in formats'
2017-02-02T01:36:31.955611+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch'
2017-02-02T01:36:31.955611+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/request.rb:57:in `fetch_header'
2017-02-02T01:36:31.955612+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/http/mime_negotiation.rb:61:in `formats'
2017-02-02T01:36:31.955613+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/public_exceptions.rb:22:in `call'
2017-02-02T01:36:31.955614+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/show_exceptions.rb:49:in `render_exception'
2017-02-02T01:36:31.955615+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/show_exceptions.rb:34:in `rescue in call'
2017-02-02T01:36:31.955615+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
2017-02-02T01:36:31.955616+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.1/lib/rails/rack/logger.rb:36:in `call_app'
2017-02-02T01:36:31.955617+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.1/lib/rails/rack/logger.rb:24:in `block in call'
2017-02-02T01:36:31.955617+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.1/lib/active_support/tagged_logging.rb:69:in `block in tagged'
2017-02-02T01:36:31.955618+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.1/lib/active_support/tagged_logging.rb:26:in `tagged'
2017-02-02T01:36:31.955619+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.1/lib/active_support/tagged_logging.rb:69:in `tagged'
2017-02-02T01:36:31.955619+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.1/lib/rails/rack/logger.rb:24:in `call'
2017-02-02T01:36:31.955620+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/request_id.rb:24:in `call'
2017-02-02T01:36:31.955621+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/method_override.rb:22:in `call'
2017-02-02T01:36:31.955621+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/runtime.rb:22:in `call'
2017-02-02T01:36:31.955622+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.1/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
2017-02-02T01:36:31.955623+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/executor.rb:12:in `call'
2017-02-02T01:36:31.955623+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.1/lib/action_dispatch/middleware/static.rb:136:in `call'
2017-02-02T01:36:31.955624+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/rack-2.0.1/lib/rack/sendfile.rb:111:in `call'
2017-02-02T01:36:31.955625+00:00 app[web.1]:   /app/lib/rack/fb_ping.rb:16:in `_call'
2017-02-02T01:36:31.955626+00:00 app[web.1]:   /app/lib/rack/fb_ping.rb:11:in `call'
2017-02-02T01:36:31.955627+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/scout_apm-2.1.21/lib/scout_apm/instruments/middleware_summary.rb:52:in `call'
2017-02-02T01:36:31.955627+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.1/lib/rails/engine.rb:522:in `call'
2017-02-02T01:36:31.955628+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/puma-3.4.0/lib/puma/configuration.rb:224:in `call'
2017-02-02T01:36:31.955629+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/puma-3.4.0/lib/puma/server.rb:569:in `handle_request'
2017-02-02T01:36:31.955629+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/puma-3.4.0/lib/puma/server.rb:406:in `process_client'
2017-02-02T01:36:31.955630+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/puma-3.4.0/lib/puma/server.rb:271:in `block in run'
2017-02-02T01:36:31.955631+00:00 app[web.1]:   /app/vendor/bundle/ruby/2.3.0/gems/puma-3.4.0/lib/puma/thread_pool.rb:114:in `block in spawn_thread'