uses-sdk:minSdkVersion 15 cannot be smaller than version 16 declared in library

The problem for me was in cordova-plugin-browsertab.

You need to change line 1 of my_project/plugins/cordova-plugin-browsertab/src/android/BrowserTab.gradle to

def minSdkVersion = 19

Make sure you have the minimum SDK added to your config.xml

<preference name="android-minSdkVersion" value="19" />

Then remove and add cordova-android by:

cordova platform remove android
cordova platform add android