您丢失了相应的public/packs/js/*.js文件。有两个解决方案：
只编译包，让rails服务器在刷新时处理重新编译

bin/webpack

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在开发中最好运行dev server，当你的文件改变时它会编译。

bin/webpack-dev-server

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请注意你的文件结构和不同的 tag helpers做什么：

app/
  assets/                # used by sprockets aka rails asset pipeline
    stylesheets/
      application.css    # stylesheet_link_tag 'application'
                         #  this is not old syntax; very much current and recommended in rails 7
    javascripts/
      application.js     # javascript_include_tag 'application'

  javascript/            # used by rails webpacker
    packs/               # keep this folder neat; don't dump everything in here
      application.js     # javascript_pack_tag 'application'
                         #  use this file to import packages from node_modules
    styles/
      application.css    # stylesheet_pack_tag 'application'
                         #  must be imported in packs/application.js
                         #  import "styles/application"
  
  node_modules/          # use yarn or npm to add js packages, don't put them in 'packs'

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如果没有其他工作为您服务：

1.运行bin/webpack && rake assets:precompile
1.确保rails在运行时没有试图编译资源，并且它可以从公共文件夹读取你的资源：

# production.rb 
config.public_file_server.enabled = true
config.assets.compile = false

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1.运行rails s