I also experienced this issue (among many others) in my attempts to get a phonegap app to work in my environment.
I found a solution in the second response (by jcesarmobile) to this question:
Error: Could not find gradle wrapper within Android SDK. Might need to update your Android SDK - Android
Specifically, I had to make sure my Android Studio and Android SDK Tools were updated to the latest version, and then I had to update my Cordova Android platform to version 6.2.2.
phonegap cordova platform rm android
phonegap cordova platform add android@6.2.2