[nodemon] app crashed - waiting for file changes before starting... 오류

좋은 강의 정말 잘 듣고 있습니다. 감사합니다.

그런데 제가 [nodemon] app crashed - waiting for file changes before starting... 오류를 종종 겪습니다.

그래서 예전에는 선생님 git hub에서 받았던 파일을 다 지우고 다시 다운받아서 실행하여 오류를 해결했습니다.

그런데 이제는 강의 중간이라 파일을 지우면 여태까지 작성했던 코드들이 다 날라가기 때문에

그렇게 하기가 두렵습니다.

혹시 이렇게 [nodemon] app crashed - waiting for file changes before starting... 오류가 나올 때

어떻게 해야 오류를 잡을 수 있을까요?

> react-boiler-plate@1.0.0 dev C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master

> concurrently "npm run backend" "npm run start --prefix client"

[0] 

[0] ┌────────────────────────────────────────────────────────────┐

[0] │                  npm update check failed                   │

[0] │            Try running with sudo or get access             │

[0] │            to the local update config store via            │

[0] │ sudo chown -R $USER:$(id -gn $USER) C:\Users\ADMIN\.config │

[0] └────────────────────────────────────────────────────────────┘

[1] 

[1] > client@0.1.0 start C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master\client

[1] > react-scripts start

[1]

[0] 

[0] > react-boiler-plate@1.0.0 backend C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master

[0] > nodemon server/index.js

[0]

[0] [nodemon] 1.19.4

[0] [nodemon] to restart at any time, enter `rs`

[0] [nodemon] watching dir(s): *.*

[0] [nodemon] watching extensions: js,mjs,json

[0] [nodemon] starting `node server/index.js`

[0] C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master\server\index.js:41

[0] app.post('/api/product/image', ko);

[0]                                ^

[0]

[0] ReferenceError: ko is not defined

[0]     at Object.<anonymous> (C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master\server\index.js:41:32)

[0]     at Module._compile (internal/modules/cjs/loader.js:1063:30)

[0]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)

[0]     at Module.load (internal/modules/cjs/loader.js:928:32)

[0]     at Function.Module._load (internal/modules/cjs/loader.js:769:14)

[0]     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)

[0]     at internal/main/run_main_module.js:17:47

[0] [nodemon] app crashed - waiting for file changes before starting...

[1] [HPM] Proxy created: /  -> http://localhost:5000

[1] i ｢wds｣: Project is running at http://192.168.0.4/

[1] i ｢wds｣: webpack output is served from 

[1] i ｢wds｣: Content not from webpack is served from C:\Users\ADMIN\Desktop\boilerplate-mern-stack-master\boilerplate-mern-stack-master\client\public

[1] i ｢wds｣: 404s will fallback to /

[1] Starting the development server...

[1] 

[1] Browserslist: caniuse-lite is outdated. Please run:

[1] npx browserslist@latest --update-db

[1] Compiled with warnings.

[1] 

[1] ./src/components/views/UploadProductPage/UploadProductPage.js

[1]   Line 2:9:    'Typography' is defined but never used          no-unused-vars

[1]   Line 24:12:  'Images' is assigned a value but never used     no-unused-vars

[1]   Line 24:20:  'setImages' is assigned a value but never used  no-unused-vars

[1]

[1] ./src/components/utils/FileUpload.js

[1]   Line 52:21:  img elements must have an alt prop, either with meaningful text, or an empty string for decorative images  jsx-a11y/alt-text

[1]   Line 53:30:  Unexpected template string expression                                                                      no-template-curly-in-string

[1]

[1] ./src/components/views/LoginPage/LoginPage.js

[1]   Line 74:11:  'dirty' is assigned a value but never used        no-unused-vars

[1]   Line 79:11:  'handleReset' is assigned a value but never used  no-unused-vars

[1]

[1] ./src/components/views/RegisterPage/RegisterPage.js

[1]   Line 92:11:  'dirty' is assigned a value but never used        no-unused-vars

[1]   Line 97:11:  'handleReset' is assigned a value but never used  no-unused-vars

[1] 

[1] Search for the keywords to learn more about each warning.

[1] To ignore, add // eslint-disable-next-line to the line before.

[1]

[1] [HPM] Error occurred while trying to proxy request /api/users/auth from localhost:3000 to http://localhost:5000 (ECONNREFUSED) (https://nodejs.org/api/errors.html#errors_common_system_errors)

npm run dev 입력 후 나오는 설명들 복사 붙여넣기 했습니다.