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Failed to convert value of type java.lang.Long to String
com.google.firebase.database.DatabaseException: Failed to convert value of type java.lang.Long to String	at com.google.android.gms.internal.zzaln.zzcc(Unknown Source)	at com.google.android.gms.internal.zzaln.zzb(Unknown Source)	at com.google.android.gms.internal.zzaln.zza(Unknown Source)	at com.google.android.gms.internal.zzaln.zzb(Unknown Source)	at com.google.android.gms.internal.zzaln$zza.zze(Unknown Source)	at com.google.android.gms.internal.zzaln$zza.zzcc(Unknown Source)	at com.google.android.gms.internal.zzaln.zzd(Unknown Source)	at com.google.android.gms.internal.zzaln.zzb(Unknown Source)	at com.google.android.gms.internal.zzaln.zza(Unknown Source)	at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)	at app.timto.co.app.AttendanceActivity$1$1.onDataChange(AttendanceActivity.java:112)	at com.google.android.gms.internal.zzaie.zza(Unknown Source)	at com.google.android.gms.internal.zzaje.zzcta(Unknown Source)	at com.google.android.gms.internal.zzajh$1.run(Unknown Source)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)