React-Native run-android command issue

First we have to install react-native then upgrade packages if you need and run android.

npm install --save react-native@latest

react-native upgrade

react-native run-android

You can try to do npm install before react-native run-android

A lot of developers fail to mention the crucial point,that certain commands require you to be a particular directory. In this case, to "react-native run-android", you have to be in your project directory!