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java.lang.NullPointerException: 	at undefined.FieldaDeserialisation.deserialize(FieldaDeserialisation.java:18)	at undefined.FieldaDeserialisation.deserialize(FieldaDeserialisation.java:1)	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:69)	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)	at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:72)	at com.google.gson.Gson.fromJson(Gson.java:887)	at com.google.gson.Gson.fromJson(Gson.java:952)	at com.google.gson.internal.bind.TreeTypeAdapter$GsonContextImpl.deserialize(TreeTypeAdapter.java:162)	at undefined.JsonDataDeserialisation.deserialize(JsonDataDeserialisation.java:20)	at undefined.JsonDataDeserialisation.deserialize(JsonDataDeserialisation.java:1)	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:69)	at com.google.gson.Gson.fromJson(Gson.java:887)	at undefined.JsonMainClass.main(JsonMainClass.java:15)