2020-03-10 react-ga [demo] npm ERR! notarget No matching version found for react-router-dom@4.4.0. github.com demo fileを $ npm install した時のerror 対処方法 package.jsonの以下を削除 "react-router": "4.4.0", "react-router-dom": "4.4.0", $ npm install manual install : react-router-dom www.npmjs.com $ npm install --save react-router-dom 実行 $ npm start localhost:8080で接続 おわり
