Answers for "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

"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

what is error make sure you have android development environment set up

use the below code :  
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