error code
MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/화이트리스트에없는 IP에서 데이터베이스에 액세스하려고해서 에러 발생
Newwork Access에 들어가서 내 IP address 추가하고 다시 npm run start
FE