LoadError: Could not load the 'listen' gem (Rails 5)

Question

I\'ve got an API mode Rails 5 app that won\'t let me run rake routes or rails s. The error I get is:

$ rake routes
rake aborted!
Lo         


        

Answer 1

I had similar problem today after upgrade from Rails 5.1.5 to 5.2.0. First time running the server there was the following 'missing assets' problem:

ActionView::Template::Error (The asset "asterisk_orange.png" is not present in the asset pipeline.)

Trying to precompile the assets shows the 'gem listen error':

$ bundle exec rake assets:precompile
rake aborted!
LoadError: Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile

My solution was to explicit set production environment:

$ RAILS_ENV=production bundle exec rake assets:precompile

This precompiles the assets w/o problems and the 'missing assets' problem was fixed.