module not found라고 뜰 때

(node:13028) [DEP_WEBPACK_DEV_SERVER_ON_AFTER_SETUP_MIDDLEWARE] DeprecationWarning: 'onAfterSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.
(Use `node --trace-deprecation ...` to show where the warning was created)
(node:13028) [DEP_WEBPACK_DEV_SERVER_ON_BEFORE_SETUP_MIDDLEWARE] DeprecationWarning: 'onBeforeSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.
Starting the development server...
Failed to compile.

Module not found: Error: Can't resolve './reportWebVitals' in 'C:\'
ERROR in ./src/index.js 8:0-48
Module not found: Error: Can't resolve './reportWebVitals' in 'C:\'

webpack compiled with 1 error
Compiling...

 

 

Module not found:

 

module not found라고 떠서 local host 3000이 실행이 안됐다 이럴 때 index.js에서 

import reportWebVitals from './reportWebVitals';

 

  

 

 해당 코드를 삭제했더니 잘 됐다

 

*) 다른 경우에서도 module not found가 뜰 수 있음