Rails: AbstractController::Helpers::MissingHelperError - Missing helper file application_helper.rb_helper.rb

Question

Can\'t find any resource that\'s helped me in this! When I try to \'rails s\' and go to any page of the app; it shoots me this error page saying I am missing helper files.

Answer 1

I started getting the same missing helper message when running tests, even though my app ran OK in dev mode. And this started right after I had run my tests successfully, with no system changes that I was aware of. After trying the suggestion to remove uppercase filenames from my path without success, I ran rvm, in my case

rvm use ruby-2.2.0@rails4.2
bundle install

The problem went away. I suspect my system had rebooted and started using some incompatible system Ruby module. I am a beginner working my way through Michael Hartl's rails tutorial on OS X 10.10.3.