'multipart/form-data' is not supported for this resource

I have WEbAPI2 back end.

I try to send form data from postman

But get this error

"No MediaTypeFormatter is available to read an object of type 'StartWorkingDay' from content with media type 'multipart/form-data'.",

Here is code of my controller

// POST: api/StartWorkingDays
[ResponseType(typeof(StartWorkingDay))]
public IHttpActionResult PostStartWorkingDay(StartWorkingDay startWorkingDay)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    db.StartWorkingDays.Add(startWorkingDay);
    db.SaveChanges();

    return CreatedAtRoute("DefaultApi", new { id = startWorkingDay.Id }, startWorkingDay);
}

When I send it via raw data, all okay

How I can make it receive multipart/form-data?