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This error typically occurs when trying to map a JSONObject that already has a parent object assigned to it. This can happen if the JSONObject was created as a property of another object and is then being mapped to a new object using Automapper.

To resolve this error, you need to either clone the JSONObject before mapping it or use a different approach to map the object. One option is to use a custom mapping function that manually maps each property of the object instead of relying on Automapper's default behavior.