expo error installing or running app - react-native

Question

when I try to run my app on the iOS simulator I get the error :
Error running xcrun simctl openurl booted exp://localhost:19000: An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=60):
The operation couldn’t be completed. Operation timed out
Operation timed out
Error installing or running app. Error: Process exited with non-zero code: 60
any idea how to solve this error ?

Answer 1

This usually is an error with the Simulator. If you remove expo (delete the app) from the simulator and run the command again, it should build fine.
However, if it still fails, Erasing all content and settings on the simulator does the trick too.

Answer 2

FOUNT IT!
you must have a .watchmanconfig file (like below)
File example
When you initialize a project with expo init "projectname", there is no .watchmanconfig file.
So, create one and in this file, just initialize an empty object like this : {}
Then you can start with expo start or yarn/npm start
It solved all my problem.
Hope it does for you too.

Answer 3

For anyone like me also searching this issue, it is possible to un-eject your app and run again like normal. From the docs, Delete the ios and android directories from your project. Delete the isDetached and detach keys from your project's app.json. You can now use your project like a normal Expo project (with no ExpoKit). Read more at https://docs.expo.io/versions/latest/expokit/advanced-expokit-topics/

Answer 4

It may be an issue with some outdated simulators in your simulator cache. On MacOS remove the sub-directories in the following directory:
~/Library/Developer/CoreSimulator/Caches/

Answer 5

check if you have .watchmanconfig file present in root, if not create one .watchmanconfig and initialize empty object and run command npm start again