Thank you first of all.
I am learning react-native, and I was currently using EXPO to build my apps and everything was fine. The problem arose now, when I created a new project from 0 (from console, react-native init NewProject) and when I gave it react-native run-android, I was not getting it right. Supposedly it is a connection problem, I have searched for days and I do not give with the solution. I leave a screen of the problem.
"dependencies": { "react": "16.3.1", "react-native": "0.55.4"}
Thank you very much
Greetings. 