npm start isn't working, react-native app - react-native

Question

im trying to build react-native app.
running the commands on gitBash, windows10.
when im trying to run 'npm start' im getting this error:
Fixed , just installed again expo-cli in the rn-starter folder, thanks for the answers :)
$ npm start
> # start C:\Users\Liran\food
> expo start
'expo-cli' is not recognized as an internal or external command,
operable program or batch file.
This command requires Expo CLI.
Do you want to install it globally [Y/n]? Y
Installing the package 'expo-cli'...
npm ERR! code EPERM
npm ERR! syscall unlink
npm ERR! path C:\Users\Liran\AppData\Roaming\npm\node_modules\expo-cli\node_modules\#expo\.xdl.DELETE\binaries\windows\adb\AdbWinApi.dll
npm ERR! errno -4048
npm ERR! Error: EPERM: operation not permitted, unlink 'C:\Users\Liran\AppData\Roaming\npm\node_modules\expo-cli\node_modules\#expo\.xdl.DELETE\binaries\windows\adb\AdbWinApi.dll'
npm ERR! [OperationalError: EPERM: operation not permitted, unlink 'C:\Users\Liran\AppData\Roaming\npm\node_modules\expo-cli\node_modules\#expo\.xdl.DELETE\binaries\windows\adb\AdbWinApi.dll'] {
npm ERR! cause: [Error: EPERM: operation not permitted, unlink 'C:\Users\Liran\AppData\Roaming\npm\node_modules\expo-cli\node_modules\#expo\.xdl.DELETE\binaries\windows\adb\AdbWinApi.dll'] {
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'unlink',
npm ERR! path: 'C:\\Users\\Liran\\AppData\\Roaming\\npm\\node_modules\\expo-cli\\node_modules\\#expo\\.xdl.DELETE\\binaries\\windows\\adb\\AdbWinApi.dll'
npm ERR! },
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'unlink',
npm ERR! path: 'C:\\Users\\Liran\\AppData\\Roaming\\npm\\node_modules\\expo-cli\\node_modules\\#expo\\.xdl.DELETE\\binaries\\windows\\adb\\AdbWinApi.dll',
npm ERR! parent: 'expo-cli'
npm ERR! }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Liran\AppData\Roaming\npm-cache\_logs\2020-10-19T09_36_58_255Z-debug.log
Installing Expo CLI failed. You can install it manually with:
npm install --global expo-cli
npm ERR! code ELIFECYCLE
npm ERR! errno 4294963248
npm ERR! # start: `expo start`
npm ERR! Exit status 4294963248
npm ERR!
npm ERR! Failed at the # start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Liran\AppData\Roaming\npm-cache\_logs\2020-10-19T09_36_58_348Z-debug.log
help please someone :)

Answer 1

Open windows terminal as Administrator and run command:
install --global expo-cli
then from the root of your project you can either run expo start or npm start both will do.

Answer 2

You need to install Expo CLI package.
see: https://docs.expo.io/workflow/expo-cli/
install:
npm install -g expo-cli
If you still getting same error do these two steps;
Be sure about working on terminal as administrator
If you're using an antivirus program, STOP it while trying to execute above command.