Error run the app Android

error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with --verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

You have to clean cache:

Step 1: Open terminal and go to Android folder:
cd android
.\gradlew clean

Step 2: go back working folder then start app:
react-native run-android