I\'ve always programmed Android with Eclipse and decided to start migrating to Android Studio. I decided to use the same SDK I already had for Eclipse, then:
Your compile SDK version must match the support library's major version.
Since you are using version 23 of the support library, you need to compile against version 23 of the Android SDK.
Alternatively you can continue compiling against version 22 of the Android SDK by switching to the latest support library v22.