Fatal Exception: java.lang.VerifyError Verifier rejected class android.support.v4.app.NotificationCompat

ANDROID FIREBASE CRASHLYTICS ERROR LOG:

Fatal Exception: java.lang.VerifyError
Verifier rejected class android.support.v4.app.NotificationCompat: android.support.v4.app.NotificationCompat$Action android.support.v4.app.NotificationCompat.getActionCompatFromAction(android.app.Notification$Action) failed to verify: android.support.v4.app.NotificationCompat$Action android.support.v4.app.NotificationCompat.getActionCompatFromAction(android.app.Notification$Action): [0x8C] register v12 has type Integer but expected Reference: android.app.FragmentTransaction (declaration of 'android.support.v4.app.NotificationCompat' appears in base.apk)
android.support.v4.app.NotificationCompatBuilder.build (NotificationCompatBuilder.java:245)
android.support.v4.app.NotificationCompat$Builder.build (NotificationCompat.java:1585)
com.elitech.offers.coupons.deals.Modules.FireBase.MyFirebaseMessagingService.sendNotif (MyFirebaseMessagingService.java:708)
com.elitech.offers.coupons.deals.Modules.FireBase.MyFirebaseMessagingService.sendNotification (MyFirebaseMessagingService.java:616)
com.elitech.offers.coupons.deals.Modules.FireBase.MyFirebaseMessagingService.onMessageReceived (MyFirebaseMessagingService.java:113)
com.google.firebase.messaging.FirebaseMessagingService.zzd (Unknown Source:60)
com.google.firebase.iid.zzc.run (Unknown Source:2)
java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1133)
java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:607)
com.google.android.gms.common.util.concurrent.zza.run (Unknown Source:6)
java.lang.Thread.run (Thread.java:761)