Object of type is not json serializable. Object reference not set to an instance of an object. nullreferenceexception. nullreferenceexception object reference. nullreferenceexception: object reference not set to an instance of an object.

Object of type is not json serializable. Object reference not set to an instance of an object. nullreferenceexception. nullreferenceexception object reference. nullreferenceexception: object reference not set to an instance of an object.
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