Application not open on IOS simulator

Description

sudo yarn run ios It will open up the ios simulator but stop at Starting simulator... and forever.

Have try

Make sure Xcode is installed and open it to accept the license agreement if it prompts you. You can install it from the Mac App Store.
Open Xcode's Preferences, the Locations tab, and make sure that the Command Line Tools menu option is set to something. Sometimes when the CLI tools are first installed by Homebrew this option is left blank, which can prevent Apple utilities from finding the simulator. Make sure to re-run npm/yarn run ios after doing so.
If that doesn't work, open the Simulator, and under the app menu select Reset Contents and Settings.... After that has finished, quit the Simulator, and re-run npm/yarn run ios.

Expected Behavior

open the RN application

Observed Behavior

What actually happened when you performed the above actions?

If there’s an error message, please paste the full terminal output and error message in this code block:

Error text goes here!

Environment

Please run these commands in the project folder and fill in their results:

• npm ls react-native-scripts:react-native-scripts@1.5.0
• npm ls react-native:react-native@0.48.4
• npm ls expo: expo@21.0.2
• node -v:v8.2.1
• npm -v:5.3.0
• yarn --version:0.27.5
• watchman version: { “version”: “4.9.0” } Also specify:

1. Operating system:OSX
2. Phone/emulator/simulator & version: 11.0 ip6

Reproducible Demo

Please provide a minimized reproducible demonstration of the problem you’re reporting.

Issues that come with minimal repro’s are resolved much more quickly than issues where a maintainer has to reproduce themselves.

[dougbacelar]

running: sudo chown my_username ~/.expo sudo chown my_username ~/.babel.json

solved my issue!

I can now run npm start without sudo, and, more importantly, npm run ios now works fine! App is now working on the simulator.

Thank you so much for the help!

[johanvdb]

I had the same issue, it looked like it was hanging, but it must have been a slow internet connection, because I left it and about 5 minutes later Expo suddenly started installing and opening the app. I did not have to apply any of the above workarounds, just had to wait.