在Heroku上部署期间Rails应用出现问题

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我是RoR的初学者。当我尝试将应用程序部署到heroku时，出现了问题。 Rails 5.2.4，Ruby 2.6.3。使用webpacker和VueJS。

I, [2020-05-09T07:02:55.526066 #1382]  INFO -- : Writing /tmp/build_40e8cc6a8411a8d1e75d6bfb262609f6/public/assets/application-cc59bdccfa610050899c3e795de8ec65abc6c9fb7f7b86124d2fba0b60a86616.js
I, [2020-05-09T07:02:55.531714 #1382]  INFO -- : Writing /tmp/build_40e8cc6a8411a8d1e75d6bfb262609f6/public/assets/application-cc59bdccfa610050899c3e795de8ec65abc6c9fb7f7b86124d2fba0b60a86616.js.gz
I, [2020-05-09T07:02:55.567485 #1382]  INFO -- : Writing /tmp/build_40e8cc6a8411a8d1e75d6bfb262609f6/public/assets/application-30c261828b50e7cc64a0cb902825d044a7c4d3c4b4573bb883bc3d050b60a20b.css
I, [2020-05-09T07:02:55.567968 #1382]  INFO -- : Writing /tmp/build_40e8cc6a8411a8d1e75d6bfb262609f6/public/assets/application-30c261828b50e7cc64a0cb902825d044a7c4d3c4b4573bb883bc3d050b60a20b.css.gz
        Compiling...
        Compilation failed:
        Hash: d7a70fbde650a1687f57
        Version: webpack 3.12.0
        Time: 9304ms
                                              Asset       Size   Chunks             Chunk Names
             store/base-ebc80531c22b584ddce6.js.map    1.02 kB        3  [emitted]  store/base
                application-567b519bd66434e7ad5b.js     123 kB  0, 2, 3  [emitted]  application
            templates/index-b95d66eda74f7d1745ad.js    1.73 kB        2  [emitted]  templates/index
                 store/base-ebc80531c22b584ddce6.js  542 bytes        3  [emitted]  store/base
            application-567b519bd66434e7ad5b.js.map     191 kB  0, 2, 3  [emitted]  application
              hello_vue-3017f5af45d58ba36cd7.js.map     113 kB        1  [emitted]  hello_vue
        templates/index-b95d66eda74f7d1745ad.js.map    3.01 kB        2  [emitted]  templates/index
                  hello_vue-3017f5af45d58ba36cd7.js      71 kB        1  [emitted]  hello_vue
                                      manifest.json  566 bytes           [emitted]  
         templates/index-b95d66eda74f7d1745ad.js.gz  884 bytes           [emitted]  
              store/base-ebc80531c22b584ddce6.js.gz  337 bytes           [emitted]  
                                   manifest.json.gz  210 bytes           [emitted]  
               hello_vue-3017f5af45d58ba36cd7.js.gz    25.2 kB           [emitted]  
             application-567b519bd66434e7ad5b.js.gz    41.5 kB           [emitted]  
           [0] (webpack)/buildin/global.js 509 bytes {0} {1} [built]
           [6] ./app/javascript/packs/store/base.js 0 bytes {0} {3} [built]
           [7] ./app/javascript/packs/templates/index.vue + 4 modules 1.53 kB {0} {2} [built]
           [8] ./app/javascript/packs/application.js + 2 modules 112 kB {0} [built]
          [11] ./app/javascript/packs/hello_vue.js + 5 modules 3.38 kB {1} [built]
            + 7 hidden modules

ERROR in ./app/javascript/app.vue
Module not found: Error: Can't resolve 'postcss-loader' in '/tmp/build_40e8cc6a8411a8d1e75d6bfb262609f6'
@ ./app/javascript/app.vue 4:0-87
@ ./app/javascript/packs/hello_vue.js

应用程序

<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>

<script>
export default {
  data: function () {
    return {
      message: "Hello Vue!"
    }
  }
}
</script>

<style>
</style>

如果您需要更多详细信息，请问我要发送什么，因为我不知道问题出在哪里:)