java.lang.NullPointerException: null reference

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java.lang.NullPointerException: null reference
at com.google.android.gms.common.internal.zzaa.zzy(Unknown Source)
at com.google.android.gms.nearby.messages.internal.zzs.subscribe(Unknown Source)
at com.example.mark.prototype9.SubActivity.subscribe(SubActivity.java:113)
at com.example.mark.prototype9.SubActivity.onConnected(SubActivity.java:134)
at com.google.android.gms.common.internal.zzk.zzp(Unknown Source)
at com.google.android.gms.internal.zzrd.zzn(Unknown Source)
at com.google.android.gms.internal.zzrb.zzass(Unknown Source)
at com.google.android.gms.internal.zzrb.onConnected(Unknown Source)
at com.google.android.gms.internal.zzrf.onConnected(Unknown Source)
at com.google.android.gms.internal.zzqr.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zzj$1.onConnected(Unknown Source)
at com.google.android.gms.common.internal.zze$zzj.zzavj(Unknown Source)
at com.google.android.gms.common.internal.zze$zza.zzc(Unknown Source)
at com.google.android.gms.common.internal.zze$zza.zzv(Unknown Source)
at com.google.android.gms.common.internal.zze$zze.zzavl(Unknown Source)
at com.google.android.gms.common.internal.zze$zzd.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5389)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)

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