java.lang.NullPointerException: println needs a message

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java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.d(Log.java:139)
at com.tradesomev4.tradesomev4.MainActivity.getAllAuctionData(MainActivity.java:136)
at com.tradesomev4.tradesomev4.MainActivity.access$100(MainActivity.java:66)
at com.tradesomev4.tradesomev4.MainActivity$2.onChildAdded(MainActivity.java:158)
at com.google.android.gms.internal.zzahh.zza(Unknown Source)
at com.google.android.gms.internal.zzajh.zzctc(Unknown Source)
at com.google.android.gms.internal.zzajk$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5637)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)

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