Ionic push java.lang.NoClassDefFoundError: com.google.android.gms.common.util.zzx

Hi guys,
I have problem with push notification. When my app starts, I setup the push but then the app crashes. I don’t understand Why.

With Fabric I catched the problem. I have this exception:

Fatal Exception: java.lang.NoClassDefFoundError: com.google.android.gms.common.util.zzx
       at com.google.android.gms.iid.zzaf.<init>(Unknown Source)
       at com.google.android.gms.iid.zzaf.<init>(Unknown Source)
       at com.google.android.gms.iid.InstanceID.getInstance(Unknown Source)
       at com.google.android.gms.iid.InstanceID.getInstance(Unknown Source)
       at com.adobe.phonegap.push.PushPlugin$1.run(PushPlugin.java:73)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
       at java.lang.Thread.run(Thread.java:841)

Could you please help me?

Thanks
L

please help me… I don’t found the solution.