When the server does not start with rails s


Webpacker::Manifest::MissingEntryError We hope that it will be useful as a solution when such an error occurs.


Mac OS Catarina 10.15.7 rails 6.0 series ruby 2.6.5

Error statement

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:


What I tried

  1. Install webpack
  2. Check if yarn is included
  3. yarn upgrade
  4. Start the server with ./bin/webpack-dev-server

If you delete the js-reading description of application.html.erb, the error disappears, but ** js cannot be read. ** **


An error occurred because the version of node is different.

The goal is to match the node version and make sure the server starts up.

Solution flow

  1. Node version check
  2. Remove / reinstall to downgrade node
  3. Node version check
  4. If the installed node is not reflected, put it in the PATH
  5. Install Webpacker
  6. If you get an error that yarn is needed, yarn install
  7. Install Webpacker again
  8. Start the server and check


*** 1. Node version check 2. Remove / reinstall to downgrade node 3. Node version check ***


% node -v
% brew uninstall --ignore-dependencies nodejs
% brew install [email protected]
% node -v

*** 4. If the installed node is not reflected, put it in the PATH ***


% vim ~/.zshrc 
% source ~/.zshrc


export PATH="/usr/local/opt/[email protected]/bin:$PATH" 

*** 5. Install Webpacker ***


% rails webpacker:install

*** 6. If you get an error that yarn is required yarn install ***


  Your Yarn packages are out of date!
  Please run `yarn install --check-files` to update.


% yarn install

*** 7. Try installing Webpacker again ***


% rails webpacker:install

*** 8. Start the server and check ***


% rails s


--Yarn is required to install Webpacker. --It may happen that it cannot be read due to the difference in version.

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