This is what my console says
8: from /app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
7: from /app/app/controllers/application_controller.rb:1:in `<main>'
6: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/action_controller/railties/helpers.rb:19:in `inherited'
5: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/abstract_controller/helpers.rb:108:in `helper'
4: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/action_controller/metal/helpers.rb:94:in `modules_for_helpers'
3: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/abstract_controller/helpers.rb:144:in `modules_for_helpers'
2: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/abstract_controller/helpers.rb:144:in `map!'
1: from /app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/abstract_controller/helpers.rb:148:in `block in modules_for_helpers'
/app/vendor/bundle/ruby/2.6.0/gems/actionpack-6.0.1/lib/abstract_controller/helpers.rb:151:in `rescue in block in modules_for_helpers': Missing helper file helpers/items_helper.rb (AbstractController::Helpers::MissingHelperError)
thanks in advance
--------Edit----------
I found out what the problem was. For some reason, whenever I push to heroku my items_helper.rb becomes Items_helper.rb. Anyone knows why or how I can solve this?