If you are getting the “permission denied” error message while trying to run ./gradlew clean or ./gradlew build manually in your project:

-bash: ./gradlew: Permission denied</div> 

You have to make the gradlew file executable. Open a terminal, navigate to the folder where your gradlew file is, and set execute permissions:

chmod +x gradlew

It is also a good idea to close the project in Android Studio while working with the gradle wrapper!