Solution when you get the error Webpacker :: Manifest :: MissingEntryError in Devise :: Sessions # new

Development environment

・ Rails 6.0.3.1 ・ Ruby 2.6.6

Situation at the time of error

$ rails s

When I run the command and access localost3000,

【error contents】


Webpacker::Manifest::MissingEntryError in Devise::Sessions#new
Showing /Users/XXXX_XXXX/Desktop/XXX_XXX_XXX/app/views/layouts/application.html.erb where line #9 raised:

Webpacker can't find application in /Users/XXXX_XXXX/Desktop/XXX_XXX_XXX/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 got the error.

The relevant part is

application.html.erb

<%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>

It is written.

Solution

$ bundle exec rails webpacker:install

I was able to resolve the error.