프론트 서버 배포 전 npm run build 시 에러 발생

강사님 지난번에 알려주신 next 설치 방법 토대로 강의 이어가는 중, 프론트 서버 배포 전 npm run build를 하면 위와 같은 에러가 발생합니다.

about.js를 지운 것이 문제인가 해서 다시 넣어보고 git pull한 뒤 npm run build를 해도 같은 에러가 발생합니다.

sudo npx pm2 start npm -- start 했을 때는 pm2가 정상적으로 작동하는 걸로 봐서 pm2 쪽 문제는 아니고 build에서 문제가 발생한 것으로 보이는데, 어느 부분이 문제일까요?

npm run build 시 발생한 에러 코드 하단에 첨부하겠습니다.

ubuntu@ip-172-31-12-20:~/react_twitter/prepare/front$ npm run build

> react-nodebird-front@1.0.0 build /home/ubuntu/react_twitter/prepare/front

> cross-env ANALYZE=true NODE_ENV=production next build

Browserslist: caniuse-lite is outdated. Please run:

npx browserslist@latest --update-db

info  - Using external babel configuration from /home/ubuntu/react_twitter/prepare/front/.babelrc

Webpack Bundle Analyzer saved report to /home/ubuntu/react_twitter/prepare/front/.next/analyze/server.html

Webpack Bundle Analyzer saved report to /home/ubuntu/react_twitter/prepare/front/.next/analyze/client.html

info  - Creating an optimized production build

info  - Compiled successfully

info  - Collecting page data

[ ===] info  - Generating static pages (0/2)getStaticProps

{ type: 'LOAD_USER_REQUEST', data: 1 }

{ type: '@@redux-saga/CHANNEL_END' }

[====] info  - Generating static pages (0/2)Error: connect ECONNREFUSED 127.0.0.1:3030

    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16) {

  errno: -111,

  code: 'ECONNREFUSED',

  syscall: 'connect',

  address: '127.0.0.1',

  port: 3030,

  config: {

    url: '/user/1',

    method: 'get',

    headers: {

      Accept: 'application/json, text/plain, */*',

      'User-Agent': 'axios/0.21.1'

    },

    baseURL: 'http://localhost:3030',

    transformRequest: [ [Function: transformRequest] ],

    transformResponse: [ [Function: transformResponse] ],

    timeout: 0,

    withCredentials: true,

    adapter: [Function: httpAdapter],

    xsrfCookieName: 'XSRF-TOKEN',

    xsrfHeaderName: 'X-XSRF-TOKEN',

    maxContentLength: -1,

    maxBodyLength: -1,

    validateStatus: [Function: validateStatus],

    data: undefined

  },

  request: <ref *1> Writable {

    _writableState: WritableState {

      objectMode: false,

      highWaterMark: 16384,

      finalCalled: false,

      needDrain: false,

      ending: false,

      ended: false,

      finished: false,

      destroyed: false,

      decodeStrings: true,

      defaultEncoding: 'utf8',

      length: 0,

      writing: false,

      corked: 0,

      sync: true,

      bufferProcessing: false,

      onwrite: [Function: bound onwrite],

      writecb: null,

      writelen: 0,

      afterWriteTickInfo: null,

      buffered: [],

      bufferedIndex: 0,

      allBuffers: true,

      allNoop: true,

      pendingcb: 0,

      prefinished: false,

      errorEmitted: false,

      emitClose: true,

      autoDestroy: true,

      errored: null,

      closed: false

    },

    _events: [Object: null prototype] {

      response: [Function: handleResponse],

      error: [Function: handleRequestError]

    },

    _eventsCount: 2,

    _maxListeners: undefined,

    _options: {

      maxRedirects: 21,

      maxBodyLength: 10485760,

      protocol: 'http:',

      path: '/user/1',

      method: 'GET',

      headers: [Object],

      agent: undefined,

      agents: [Object],

      auth: undefined,

      hostname: 'localhost',

      port: '3030',

      nativeProtocols: [Object],

      pathname: '/user/1'

    },

    _ended: true,

    _ending: true,

    _redirectCount: 0,

    _redirects: [],

    _requestBodyLength: 0,

    _requestBodyBuffers: [],

    _onNativeResponse: [Function (anonymous)],

    _currentRequest: ClientRequest {

      _events: [Object: null prototype],

      _eventsCount: 7,

      _maxListeners: undefined,

      outputData: [],

      outputSize: 0,

      writable: true,

      destroyed: false,

      _last: true,

      chunkedEncoding: false,

      shouldKeepAlive: false,

      _defaultKeepAlive: true,

      useChunkedEncodingByDefault: false,

      sendDate: false,

      _removedConnection: false,

      _removedContLen: false,

      _removedTE: false,

      _contentLength: 0,

      _hasBody: true,

      _trailer: '',

      finished: true,

      _headerSent: true,

      socket: [Socket],

      _header: 'GET /user/1 HTTP/1.1\r\n' +

        'Accept: application/json, text/plain, */*\r\n' +

        'User-Agent: axios/0.21.1\r\n' +

        'Host: localhost:3030\r\n' +

        'Connection: close\r\n' +

        '\r\n',

      _keepAliveTimeout: 0,

      _onPendingData: [Function: noopPendingOutput],

      agent: [Agent],

      socketPath: undefined,

      method: 'GET',

      maxHeaderSize: undefined,

      insecureHTTPParser: undefined,

      path: '/user/1',

      _ended: false,

      res: null,

      aborted: false,

      timeoutCb: null,

      upgradeOrConnect: false,

      parser: null,

      maxHeadersCount: null,

      reusedSocket: false,

      host: 'localhost',

      protocol: 'http:',

      _redirectable: [Circular *1],

      [Symbol(kCapture)]: false,

      [Symbol(kNeedDrain)]: false,

      [Symbol(corked)]: 0,

      [Symbol(kOutHeaders)]: [Object: null prototype]

    },

    _currentUrl: 'http://localhost:3030/user/1',

    [Symbol(kCapture)]: false

  },

  response: undefined,

  isAxiosError: true,

  toJSON: [Function: toJSON]

}

TypeError: Cannot read property 'data' of undefined

    at loadUser (/home/ubuntu/react_twitter/prepare/front/.next/server/pages/_app.js:606:27)

    at loadUser.throw (<anonymous>)

    at next (/home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:1071:32)

    at currCb (/home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:1196:7)

    at /home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:347:5

    at processTicksAndRejections (internal/process/task_queues.js:93:5)

The above error occurred in task loadUser

    created by takeLatest(LOAD_USER_REQUEST, loadUser)

    created by watchLoadUser

    created by userSaga

    created by rootSaga

Error occurred prerendering page "/about". Read more: https://err.sh/next.js/prerender-error

TypeError: Cannot read property 'data' of undefined

    at loadUser (/home/ubuntu/react_twitter/prepare/front/.next/server/pages/_app.js:606:27)

    at loadUser.throw (<anonymous>)

    at next (/home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:1071:32)

    at currCb (/home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:1196:7)

    at /home/ubuntu/react_twitter/prepare/front/node_modules/@redux-saga/core/dist/redux-saga-core.prod.cjs.js:347:5

    at processTicksAndRejections (internal/process/task_queues.js:93:5)

> Build error occurred

Error: Export encountered errors on following paths:

        /about

    at exportApp (/home/ubuntu/react_twitter/prepare/front/node_modules/next/dist/export/index.js:25:1103)

    at processTicksAndRejections (internal/process/task_queues.js:93:5)

    at async build (/home/ubuntu/react_twitter/prepare/front/node_modules/next/dist/build/index.js:39:69)

[    ] info  - Generating static pages (0/2)npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! react-nodebird-front@1.0.0 build: `cross-env ANALYZE=true NODE_ENV=production next build`

npm ERR! Exit status 1

npm ERR!

npm ERR! Failed at the react-nodebird-front@1.0.0 build script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

npm ERR!     /home/ubuntu/.npm/_logs/2021-02-25T07_24_14_025Z-debug.log