Switched to a LAN URL because the tunnel appears to be down. Only devices in the same network can access the app. You can restart the project to try reconnecting.
Due to some bug you must start xde (expo development environment) before genymotion. Also i needed to run xde from root user login. (not su or sudo ).
UPDATE: The following problem of adb version fixed this problem too.
Couldn’t start project on Android: could not install *smartsocket* listener: Address already in use
ADB server didn’t ACK
* failed to start daemon *
error: cannot connect to daemon
the adb version on your system is different from the adb version on the android sdk platform-tools
1. check sys adb version
# adb version
Android Debug Bridge version 1.0.39
2. check sdk adb version
# cd /root/Android/Sdk/platform-tools
# ./adb version
Android Debug Bridge version 1.0.32
# rm /usr/bin/adb
# sudo cp /root/Android/Sdk/platform-tools/adb /usr/bin/adb
Error: EACCES: permission denied, open ‘/tmp/haste-map-react-native-packager-1-8963e41d25a58e25717f5939e5144fc2
Solution: sudo rm /tmp/haste-map-react-native-packager-1-8963e41d25a58e25717f5939e5144fc2
The development server returned response error code: 500
For me this error was resolved running yarn in the project folder. The cause may have been due to the fact that I’d switched branches and some of the packages were not installed.