Not working when XmlFormatter removed

[CodeLearner21]

First of all thanks for this easy to us module.
Now I am facing some issue after use of JsonFormatter setting.
here is my code

var json = config.Formatters.JsonFormatter; json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects; config.Formatters.Remove(config.Formatters.XmlFormatter);

when I removed this code all relationship works properly but it is necessary to use it.

Thanks