node.js를 사용하기 위해 express를 설치할 때 였다. 123456789101112131415161718192021222324252627282930$ npm install express npm http GET https://registry.npmjs.org/expressnpm http GET https://registry.npmjs.org/expressnpm http GET https://registry.npmjs.org/expressnpm ERR! Error: UNABLE_TO_GET_ISSUER_CERT_LOCALLYnpm ERR! at SecurePair. (tls.js:1430:32)npm ERR! at SecurePair.emit (events.js:92:17)npm ERR! at Se..