Asp.Net Core and Returning IEnumerable from Web API

I'm trying to return an IEnumerable and getting error on the "return results statement" as "Error    CS0266    Cannot implicitly convert type 'System.Collections.IEnumerable' to 'System.Collections.Generic.IEnumerable<SP_API.Models.DB.vScheduleDetail>'. An explicit conversion exists (are you missing a cast?)    SP_API..NETCoreApp,Version=v1.0    D:\Scheduler+Plus Web Apps\SP_API\src\SP_API\Repository\vScheduleDetailRepository.cs"
Here is my code.  Note that the commented out line works fine, but I want to have a more detailed selection of data.

public IEnumerable<vScheduleDetail> GetbyScheduleMasterId(int key)
{
   var result = from vScheduleDetail in _context.vScheduleDetail
                select vScheduleDetail;
   result = result.Where(e => e.ScheduleMasterId == key);
   result = result.Where(e => e.Swapped != "1");
   result = result.OrderBy(e => e.Date).ThenBy(e => e.SeqNbr);
   IEnumerable results = result.AsEnumerable();
   return results;
   //return _context.vScheduleDetail.Where(e => e.ScheduleMasterId == key).AsEnumerable();
}

Thanks in advance for assisting with this.
Mark