HazelcastSerializationException

nested exception is com.hazelcast.nio.serialization.HazelcastSerializationException: 
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "btalkId", 
not marked as ignorable (one known property: "customerId"])

at [Source: (String)"{

"customerId" : "DS3l1Bl_RGz2",

"btalkId" : "0edc1246-cb45-4f87-bdc0-9768890c6614"

}"; line: 3, column: 16] (through reference chain: BTalk["btalkId"]);

public class BtalkKey implements JsonSerializable {    
	private String bTalkId;
}