SHELL

Failed to install the app. Make sure you have the Android development environment set up

"Failed to install the app"
"Make sure you have the Android development environment set up"
run below code in terminal =>
react-native start --reset-cache

error Failed to install the app. Make sure you have the Android development environment set up

cd android
chmod +x gradlew

react native error Failed to install the app. Make sure you have the Android development environment

was receiving this error message when running react-native run-android. 
When I ran cd android && ./gradlew clean I was getting permission errors also. 
I ran chmod +x gradlew and it started working

Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup.

In my case I uninstalled the Node js and deleted Choclaty folder from C:
and  restarted the computer and then installed Node JS and Choclaty according to React Native official web
and created a new React_Natvie_CLI Project and new Project starts successfully