com.google.firebase.database.DatabaseException: No properties to serialize found on class Person

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No properties to serialize found on class Person
com.google.firebase.database.DatabaseException: No properties to serialize found on class Person
at com.google.firebase.database.utilities.encoding.CustomClassMapper$BeanMapper.(CustomClassMapper.java:495)
at com.google.firebase.database.utilities.encoding.CustomClassMapper.loadOrCreateBeanMapperForClass(CustomClassMapper.java:285)
at com.google.firebase.database.utilities.encoding.CustomClassMapper.convertBean(CustomClassMapper.java:379)
at com.google.firebase.database.utilities.encoding.CustomClassMapper.deserializeToClass(CustomClassMapper.java:187)
at com.google.firebase.database.utilities.encoding.CustomClassMapper.convertToCustomClass(CustomClassMapper.java:61)
at com.google.firebase.database.DataSnapshot.getValue(DataSnapshot.java:181)
at com.google.firebase.database.Query$1.onDataChange(Query.java:147)
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:57)
at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:45)
at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:35)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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