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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 undefined.PetEventsNodeActorSpec$$anonfun$2$$anonfun$apply$mcV$sp$2$$anonfun$apply$mcV$sp$3$$anon$1.onDataChange(PetEventsNodeActorSpec.scala:290)	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)