Asset filtered out and will not be served

[paneq]

Following the instructions in README for bundle exec rake konacha:serve Rails 4.2 leads an error upon visiting the page in browser:

ActionView::Template::Error at /
Asset filtered out and will not be served: add `Rails.application.config.assets.precompile += %w( konacha.css )` to `config/initializers/assets.rb` and restart your server

I had to add config.assets.precompile += %w( konacha.css mocha.js konacha/parent.js chai.js konacha/iframe.js array_sum_spec.js) in development.rb to make it work or

config.assets.precompile += %w( konacha.css mocha.js konacha/parent.js chai.js konacha/iframe.js)
config.assets.precompile += [/.*_spec\.js/]

Related:

• http://stackoverflow.com/questions/22970573/asset-filtered-out-and-will-not-be-served-add-config-assets-precompile

[paneq]

For rake konacha:run to work I had to add konacha/runner.js to the list as well

[jfirebaugh]

Konacha's default setting of app.config.assets.raise_runtime_errors = false disables this error. Have you overridden the default?