com.android.ddmlib.InstallException: Failed to establish session react-native

Question

I am trying to run react-native android app in my nexus5 emulator

adb devices
List of devices attached
emulator-5554   device

started pack

Answer 1

In my case, I have to run this command in
/sdklocation/platform-tools/

 adb kill-server

then run again and watch for install request on the phone.
hope this help some one