How to resolve this problem cannot constructed in LING

Error: System.NotSupportedException: 'The entity or complex type 'ECommercedbModel.ProductDetail' cannot be constructed in a LINQ to Entities query.'

public ProductViewModel GetProductByID(int ID)
{
ProductViewModel listprod = new ProductViewModel();
try
{
var productsl = (from p in _db.Products
where p.ProductID == ID
select new Product
{
PName= p.PName,
PDescription= p.PDescription,
Model= p.Model,
Condition= p.Condition,
UnitPrice=p.UnitPrice,
ManificturedPrice=p.ManificturedPrice,
Discount=p.Discount,
UnitWeight=p.UnitWeight,
UnitInStock=p.UnitInStock
}).FirstOrDefault();
var productD = (from pd in _db.ProductDetails
join b in _db.Products on pd.ProductID equals b.ProductID
where pd.ProductID == ID
select new ProductDetail
{
ProductID =pd.ProductID,
OS=pd.OS,
ProcessorType=pd.ProcessorType,
RAM=pd.RAM,
ScreenSize=pd.ScreenSize,
TouchScreen=pd.TouchScreen,
BatteryLife=pd.BatteryLife,
Camera=pd.Camera
}).ToList();
return new ProductViewModel { listProducts = productsl, listProductDetails = productD };
}
catch (Exception)
{
throw;
}
}