An error occurred while running subprocess native-run

Question

I am new to IONIC. I am learning it.
I am trying to run the ionic app for android but it gives me below error.

Build is successful but an error occurred while running subprocess native-run.
If i run the ionic app for browser, then it's okay. No error happens

Update my IONIC version to 5.4.9
And Platform-Tools to 29.0.5

Error change:

[native-run] No hardware devices found, attempting emulator...
[native-run] Selected emulator emulator-5554
[native-run]Installing platforms\android\app\build\outputs\apk\debug\app-debug.apk...
[native-run] ERR_UNKNOWN: Non-zero exit code from adb: 1
[ERROR]An error occurred while running subprocess native-run.

Answer 1

Device offline...There's no device connected to your computer or you have not enabled debugging on your device. If you are not running it on a device run the command ionic cordova run android --emulator Ensure you have an emulator in your android sdk.

Answer 2

some times you may not activated the developer mode on your device.