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  • You say "I tried to open localhost:3000/err but, it will not got to NotFound component.". What do you get instead? I did just try to use your code (using "react-router-dom": "^4.3.1), and it works just fine (on localhost:3000/err I get "404 Page Not Found"). Commented Jan 15, 2019 at 13:57
  • @MarcoS i got Cannot GET /err Commented Jan 15, 2019 at 13:58
  • Does your project compile successfully? I.e.: do you get something like Compiled successfully! on your yarn start command? And, above all, something like You can now view my-app in the browser. ? Commented Jan 15, 2019 at 14:00
  • @MarcoS Yes. i ｢wdm｣: Compiled successfully. Commented Jan 15, 2019 at 14:01
  • Does localhost:3000/ works fine? Commented Jan 15, 2019 at 14:02