Could not install the app on the device

[klxin]

Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

[kelset]

As the error state, it seems like you haven't followed the setup guidelines for Android. I suggest you go through them carefully and; moreover, you haven't followed the issue template.