java.lang.NullPointerException: println needs a message

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Thrown when an application is trying to use or access an object whose reference equals to null. In this case, the log message cannot be null.

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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:143)
at com.snapwebdevelopment.scanhappy.SignupActivity$1.onComplete(SignupActivity.java:105)
at com.google.android.gms.tasks.zzc$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)

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