react-native run-ios --device "xxx" stuck at "installing and launching your app on xxx..."

[beobungbu]

After init Demo folder, i tried to debug on real device but it always stuck at "installing and launching your app on xxx..."
here is some last of terminal :

* BUILD SUCCEEDED *

The following commands produced analyzer issues:
Analyze Base/RCTModuleMethod.mm normal arm64
(1 command with analyzer issues)

installing and launching your app on xxx...

on the terminal title :

Demo ---node /usr/local/bin/react-native run-ios --device xxx > lldb

if uses Xcode for debug so it is running fine.

what happening to me ?

Project init by react-native init demo
Scanning folders for symlinks in /Users/lantranduc/workspace/PropertyFinder/node_modules (20ms)

React Native Environment Info:
System:
OS: macOS High Sierra 10.13.6
CPU: x64 Intel(R) Core(TM) i7-3615QM CPU @ 2.30GHz
Memory: 18.70 MB / 8.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 10.8.0 - /usr/local/bin/node
npm: 6.2.0 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 11.4, macOS 10.13, tvOS 11.4, watchOS 4.3
IDEs:
Android Studio: 3.1 AI-173.4907809
Xcode: 9.4.1/9F2000 - /usr/bin/xcodebuild
npmPackages:
react: 16.4.1 => 16.4.1
react-native: 0.56.0 => 0.56.0
npmGlobalPackages:
create-react-native-app: 1.0.0
eslint-plugin-react-native: 3.2.1
react-native-cli: 2.0.1

[react-native-bot]

Please use Stack Overflow for this type of question.

[mariorodriguespt]

My CI (MS AppCenter) is stuck on this issue, it's far from being a SO questions.

[smitthakkar1]

same here
please let me know if you found any solution

[yonghongren]

I had the same symptom this morning. In my case the problem was caused by a python environment change. The hang is wating to spawn 'ios-deploy' (see ./node_modules/react-native/local-cli/runIOS/runIOS.js), which won't start due to a change to python environment I made last night. You may want to check ./node_modules/react-native/local-cli/runIOS/runIOS.js to understand why the spawn won't succeed.