I had the same problem. Upgrading npm fixed this for me.
BUILD SUCCESSFUL
Total time: 1.73 secs
Built the following apk(s):
android-debug.apk
ionic info
@ionic/cli-utils : 1.12.0
ionic (Ionic CLI) : 3.12.0
global packages:
cordova (Cordova CLI) : 7.0.1
local packages:
@ionic/app-scripts : 3.0.0
Cordova Platforms : android 6.2.3
Ionic Framework : ionic-angular 3.7.1
System:
Android SDK Tools : 26.0.2
Node : v6.11.4
npm : 5.4.2
OS : Windows 10
Misc:
backend : legacy
–
Also ran “npm update” in the app folder