Airpush app integration not working properly
<p>Hi I am using Airpush in my app according to this <a href="http://docs.airpush.com/index.php/Universal_SDK_8.13" rel="nofollow">official link</a>. But I am showing only Banner ads. Nothing more. I have integrated SmartWall, Notification Ads and Icon Ads. But I don't get them. Here is my logcat</p>

<blockquote>
  <p>04-07 08:10:36.761 3477-3477/bengal.golden.com.airpush E/dalvikvm: Could not find class 'android.os.UserManager', referenced from method com.google.android.gms.common.zze.zzaq
  04-07 08:10:36.761 3477-3477/bengal.golden.com.airpush E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.common.zze.zzb
  04-07 08:10:37.011 3477-3477/bengal.golden.com.airpush E/GMPM: GoogleService failed to initialize, status: 10, Missing an expected resource: 'R.string.google_app_id' for initializing Google services.  Possible causes are missing google-services.json or com.google.gms.google-services gradle plugin.
  04-07 08:10:37.011 3477-3477/bengal.golden.com.airpush E/GMPM: Scheduler not set. Not logging error/warn.
  04-07 08:10:37.091 3477-3511/bengal.golden.com.airpush E/GMPM: Uploading is not possible. App measurement disabled
  04-07 08:15:38.055 3477-3477/bengal.golden.com.airpush E/USDK: Error occurred while showing Cache ad: SmartWall ad is not available in cache</p>
</blockquote>

<p><strong>NB: Log Level - Error Only</strong></p>

<p>Please help. Or if you can show me or give me a link which give me a detailed tutorial of Airpush SDK 8.13 integration, I will be so pleased...</p>