java.lang.NullPointerException: Attempt to invoke interface method 'com.google.gson.TypeAdapter com.google.gson.TypeAdapterFactory.create(com.google.gson.Gson, com.google.gson.reflect.TypeToken)' on a null object reference
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.Gson.fromJson(Gson.java:926)
at com.google.gson.Gson.fromJson(Gson.java:892)
at com.google.gson.Gson.fromJson(Gson.java:841)
at com.google.gson.Gson.fromJson(Gson.java:813)