webpacker: Webpacker::Manifest::MissingEntryError

I’ve started a rails project using the rails new and --webpack=react. I generated a new controller updated my postgresql password in the database.yml. Up to this point everything works fine. At this point all I’m trying to do is get react to render the default hello_react.jsx file the was generated as an example by rails. When I put the <%= javascript_pack_tag 'hello_react' %> in my view and run the server I get the following error.

Webpacker::Manifest::MissingEntryError in Home#index Showing G:/…/…/…/myGroceryList/app/views/home/index.html.erb where line #1 raised:

Webpacker can’t find hello_react.js in G:/…/…/…/myGroceryList/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: { }

I have pushed the project up to github. Any thought on what is going wrong?

UPDATE: I’ve posted the same question on Stackoverflow. There is a bit more discussion there that might help.

RESOLUTION: As best I can tell this error fires when your public/packs folder is missing the Manifest file or is missing all together. What was happening in my case was Webpackers compilation step was silently failing and not creating the public/packs folder.