Rails: Webpacker::Manifest::MissingEntryError in Home#index

Question

Webpacker::Manifest::MissingEntryError in Home#index Showing /Users/khalidhosein/Desktop/myEPKmedia/builder/khalid101/app/views/layouts/embedded_app.html.erb where line #7 raised:

Webpacker can't find hello_react.js in /Users/khalidhosein/Desktop/myEPKmedia/builder/khalid101/public/packs/manifest.json. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
{
  "application.js": "/packs/application-68dcba18197451fbb79e.js",
  "application.js.map": "/packs/application-68dcba18197451fbb79e.js.map"
}
Extracted source (around line #7):
5
6
7
8
9
10

    <% application_name = ShopifyApp.configuration.application_name %>
    <title><%= application_name %></title>
    <%= javascript_pack_tag 'hello_react' %>
    <%= stylesheet_link_tag 'application' %>
    <%= javascript_include_tag 'application', "data-turbolinks-track" => true %>
    <%= csrf_meta_tags %>

Rails.root: /Users/khalidhosein/Desktop/myEPKmedia/builder/khalid101

Application Trace | Framework Trace | Full Trace
app/views/layouts/embedded_app.html.erb:7:in `_app_views_layouts_embedded_app_html_erb___4509380428416253144_70127991029820'
Request
Parameters:

None

I am getting this error when trying to connect my Rails app with a React front end. I've tried researching and re-configuring files from all sources. I have also recreated manifiest.json files and packs libraries. I am following this tutorial:

https://github.com/natemacinnes/natemacinnes.github.io/blob/master/rails-5-shopify-app-setup.md

If anyone has any ideas it would be greatly appreciated as there isn't much documentation or tutorials out there going over connecting Rails Shopify API with React.

MY CODE---->https://github.com/KhalidH82/ShopifyApp-React-Rails

Answer 1

Though I am not using react, but was getting the same error on a newly created Rails 6 app. Reinstalling webpacker fixed it for me:

bundle exec rake webpacker:install

I guess it probably was some missing dependency, or a bug in an older version (I noticed webpack-dev-server version was upgraded to 3.8.1).