Execution failed for task ‘:app:installDebug’ react native run android

Issue

When we tried to run the react native android app, the build was failing. The app was not starting giving the following error messages:

* What went wrong:
Execution failed for task ':app:installDebug'.
> com.android.builder.testing.api.DeviceException: No connected devices!

BUILD FAILED in 1s
27 actionable tasks: 1 executed, 26 up-to-date
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have

Reason

The reason of the issue mentioned on the error message. It said the emulator is either not running or not connected. We had a defafult android virtual device called Nexus 5X API 28 x86. We created our custom android virtual device called Pixel 2 API 27. But none of the virtual devices was started.

Solution

When we start the android virtual device Pixel 2 API 27 and then tried to run the react native android app ($ react-native run-android) the error was gone.

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