エラーです。ルールは1つのリソースソースしか持つことができません
(提供されたリソースとテスト + 含む + 除外)

問題：エラー。ルールは1つのリソースソースしか持つことができません（提供されたリソースとテスト＋インクルード＋エクスクルード）。

Error: Rule can only have one resource source (provided resource and test + include + exclude) in
 "exclude": [
    null
  ],
  "use": [
    {
      "loader": "/Users/juanpablo/front-treatments/node_modules/cache-loader/dist/cjs.js",
      "options": {
        "cacheDirectory": "/Users/juanpablo/front-treatments/node_modules/.cache/babel-loader",
        "cacheIdentifier": "81fef5a6"
      },
      "ident": "clonedRuleSet-38[0].rules[0].use[0]"
    },
    {
      "loader": "/Users/juanpablo/front-treatments/node_modules/babel-loader/lib/index.js",
      "options": "undefined",
      "ident": "undefined"
    }
  ]
} ````
A complete log of this run can be found in:
0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli '/Users/juanpablo/.nvm/versions/node/v12.19.0/bin/node',
1 verbose cli '/Users/juanpablo/.nvm/versions/node/v12.19.0/bin/npm',
1 verbose cli 'run',
1 verbose cli 'serve'
1 verbose cli ]
2 info using [email protected]
3 info using [email protected]
4 verbose run-script [ 'preserve', 'serve', 'postserve' ]
5 info lifecycle [email protected]~preserve: [email protected]
6 info lifecycle [email protected]~serve: [email protected]
7 verbose lifecycle [email protected]~serve: unsafe-perm in lifecycle true
8 verbose lifecycle [email protected]~serve: PATH: /Users/juanpablo/.nvm/versions/node/v12.19.0/lib/node_modules/npm/node_modules/npm -lifecycle/node-gyp-bin:/Users/juanpablo/front-treatments/node_modules/.bin:/Users/juanpablo/.nvm/versions/node/v12.19.0/bin:/usr/ local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/juanpablo/.rvm/bin
9 verbose lifecycle [email protected]~serve: CWD: /Users/juanpablo/front-treatments
10 silly lifecycle [email protected]~serve: Args: [ '-c', 'vue-cli-service-serve' ]
11 silly lifecycle [email protected]~serve: Returned: code: 1 signal: null
12 info lifecycle [email protected]~serve: Failed to exec serve script
13 verbose stack Error: [email protected] serve: `vue-cli-service-serve`
13 verbose stack Exit status 1
13 verbose stack at EventEmitter.
 (/Users/juanpablo/.nvm/versions/node/v12.19.0/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
13 verbose stack at EventEmitter.exit (events.js:314:20)
13 verbose stack at ChildProcess.
 (/Users/juanpablo/.nvm/versions/node/v12.19.0/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack at ChildProcess.exit (events.js:314:20)
13 verbose stack at maybeClose (internal/child_process.js:1021:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
14 verbose pkgid [email protected]
15 verbose cwd /Users/juanpablo/front-treatments
16 verbose Darwin 19.6.0
17 verbose argv "/Users/juanpablo/.nvm/versions/node/v12.19.0/bin/node" "/Users/juanpablo/.nvm/versions/node/v12.19.0/ bin/npm" "run" "serve"
18 verbose node v12.19.0
19 verbose npm v6.14.8
20 error code ELIFECYCLE
21 error errno 1
22 error [email protected] serve: `
vue-cli-service serve`
22 error Exit status 1
23 error Failed at the [email protected] serve script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

原因分析。

package.jsonにWebpackのバージョン競合の問題があります。

解決策

webpackを削除し、以前のバージョンを再インストールします。
npm uninstall webpack
npm install webpack@^4.0.0 --save-dev