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com.google.firebase.database.DatabaseException: Class com.google.firebase.udacity.friendlychat.FriendlyMessage is missing a constructor with no arguments	at com.google.android.gms.internal.zzbqi$zza.zze(Unknown Source)	at com.google.android.gms.internal.zzbqi$zza.zzaG(Unknown Source)	at com.google.android.gms.internal.zzbqi.zze(Unknown Source)	at com.google.android.gms.internal.zzbqi.zzb(Unknown Source)	at com.google.android.gms.internal.zzbqi.zza(Unknown Source)	at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)	at com.google.firebase.udacity.friendlychat.MainActivity$6.onChildAdded(MainActivity.java:290)	at com.google.android.gms.internal.zzblz.zza(Unknown Source)	at com.google.android.gms.internal.zzbnz.zzYj(Unknown Source)	at com.google.android.gms.internal.zzboc$1.run(Unknown Source)	at android.os.Handler.handleCallback(Handler.java:751)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:154)	at android.app.ActivityThread.main(ActivityThread.java:6688)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)