라우터 세팅시 에러

SHOP 폴더에서 터미널을 열어 yarn 을 통해 라우터 설치를 완료했습니다. 

arn add v1.22.10
warning ../package.json: No license field
info No lockfile found.
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
[1/4] ? Resolving packages...
warning react-scripts > babel-eslint@10.1.0: babel-eslint is now @babel/eslint-parser. This package will no longer receive updates.
warning react-scripts > webpack-dev-server > chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
warning react-scripts > webpack-dev-server > chokidar > fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
warning react-scripts > resolve-url-loader > rework > css > urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
warning react-scripts > resolve-url-loader > rework > css > source-map-resolve > urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
warning react-scripts > resolve-url-loader > rework > css > source-map-resolve > resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi@15.1.1: Switch to 'npm install joi'
warning react-scripts > workbox-webpack-plugin > workbox-build > rollup-plugin-babel@4.4.0: This package has been deprecated and is no longer maintained. Please use @rollup/plugin-babel.
warning react-scripts > webpack-dev-server > sockjs > uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Math.random() in certain circumstances, which is known to be problematic. See https://v8.dev/blog/math-random for details.
warning react-scripts > webpack-dev-server > webpack-log > uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Math.random() in certain circumstances, which is known to be problematic. See https://v8.dev/blog/math-random for details.
warning react-scripts > webpack > watchpack > watchpack-chokidar2 > chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi > @hapi/address@2.1.4: Moved to 'npm install @sideway/address'
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi > @hapi/bourne@1.3.2: This version has been deprecated and is no longer supported or maintained
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi > @hapi/topo@3.1.6: This version has been deprecated and is no longer supported or maintained
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi > @hapi/hoek@8.5.1: This version has been deprecated and is no longer supported or maintained
warning react-scripts > workbox-webpack-plugin > workbox-build > @hapi/joi > @hapi/topo > @hapi/hoek@8.5.1: This version has been deprecated and is no longer supported or maintained
warning react-scripts > workbox-webpack-plugin > workbox-build > strip-comments > babel-plugin-transform-object-rest-spread > babel-runtime > core-js@2.6.12: core-js@<3.3 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Please, upgrade your dependencies to the actual version of core-js.
[2/4] ? Fetching packages...
[3/4] ? Linking dependencies...
warning " > @testing-library/user-event@12.8.3" has unmet peer dependency "@testing-library/dom@>=7.21.4".
warning " > bootstrap@4.6.0" has unmet peer dependency "jquery@1.9.1 - 3".
warning " > bootstrap@4.6.0" has unmet peer dependency "popper.js@^1.16.1".
warning "react-scripts > @typescript-eslint/eslint-plugin > tsutils@3.21.0" has unmet peer dependency "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta".
[4/4] ? Building fresh packages...
success Saved lockfile.
success Saved 931 new dependencies.

다음과 같이 warning 메세지가 나오긴했지만 success가 되었다고 표기가 됩니다.

import { BrowserRouter } from 'react-router-dom'; 와<BrowserRouter></BrowserRouter>을 추가했지만

다음과 같은 에러가 발생합니다.

Failed to compile

./src/index.js
Error: [BABEL] /Users/junminlee/Desktop/vscode/코딩애플/react-class/shop/src/index.js: Cannot find module '/Users/junminlee/Desktop/vscode/코딩애플/react-class/shop/node_modules/semver/index.js'. Please verify that the package.json has a valid "main" entry (While processing: "/Users/junminlee/Desktop/vscode/코딩애플/react-class/shop/node_modules/babel-preset-react-app/index.js$0")

해결방안을 모르겠습니다. 구글에서는 바벨..이야기를 하는데 잘 모르겠습니다.