Error: failed to find target with hash string 'android-21'

Question

I want to change my compileSdkVersion from 23 to 21.So I have made following changes in the build.gradle but I am getting following error.How can I resolve this?

Answer 1

Below is for Android studio 1. Go to app -> build.gradle -> change "compileSdkVersion 'installed sdk version'"

2. Go to Tools -> Android -> sync project with gradle files

That's it, problem solved:-)