JS server not recognized, continuing with build

Question

Environment

Windows 10

Npm 5.5.1

react-native-cli 2.0.1

react-native 0.50.3

Genymotion Google Nexus 7 - 6.0.0 API 23

Answer 1

In my case (had the same error) I simply checked netstat in win CMD (check for reference). My problem was running another instance on port :8081 so I had to kill the bastard.

1. Close all running local server instances.
2. Check link for reference on killing :8081 proccess on Windows
3. Rebuild & rerun project.
4. Profit