could not be mapped to a JSON object. Perhaps it hasn't been annotated with @JsonObject

i am trying to fetch data from `Realm` and sending it to server using `retrofit` and for parsing and serializing i am using `LoganSquare`

```
client = new Retrofit.Builder()
.baseUrl(REST_ENDPOINT)
.client(okHttpClient)
.addConverterFactory(LoganSquareConverterFactory.create())
.build();
```

this is how i am accessing record

```
Appointment appointments = DB.getInstance(mContext).selectNotSyncAppointmentsData();
RestApi.AppointmentsDataApi service = getAppointmentsDataApi();
Call call = service.createUpdateAppointmentsData(appointments);
```

i am getting following error

```
createUpdateAppointmentData : onFailure Class io.realm.AppointmentRealmProxy could not be mapped to a JSON object. Perhaps it hasn't been annotated with @JsonObject?
```

Start by tracing the createUpdateAppointmentsData request from Appointment through Retrofit and LoganSquareConverterFactory, then inspect the reported io.realm.AppointmentRealmProxy mapping failure. Reproduce the request with the shown Realm record and determine what behavior or annotation the library expects; done means the record can be serialized for the request without this error.

Written by the indexing model from the issue text.