Add required gs

build.gradle

@@ -11,6 +11,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.google.gms:google-services:3.0.0'
     }
 }
 
@@ -193,3 +194,4 @@ tasks.withType(Test) {
     }
 }
 
+apply plugin: 'com.google.gms.google-services'

src/custom/java/MainApp.java

@@ -200,7 +200,6 @@ public class MainApp extends Application {
         if (mTracker == null) {
             GoogleAnalytics analytics = GoogleAnalytics.getInstance(this);
             // To enable debug logging use: adb shell setprop log.tag.GAv4 DEBUG
-            //mTracker = analytics.newTracker(R.xml.global_tracker);
             mTracker = analytics.newTracker(analyticsID);
         }
         return mTracker;