[Solved] column will not bind

[william]

Hi All,

I have the following code:

columns.Bound(r => r.Description).Title("Description").Encoded(false);
                    columns.Bound(r => r.Covers.Sum(m => m.SumInsured)).Title("Sum Insured");
                    columns.Bound(r => r.Covers.Sum(m => m.Excess)).Title("Excess");
                    columns.Bound(r => r.Covers.Sum(m => m.IncreasedXSDiscount)).Title("Increased XS Discount");
                    columns.Bound(r => r.Covers.Sum(m => m.Rate)).Title("Rate");
                    columns.Bound(r => r.TechnicalPrice).Title("Technical Price");

When I run the code, it errors on my second column.Bound where I'm trying to display a Sum amount.
The error is : Bound Columns require a field or property access expression.

Covers is an IEnumerable of a class declared on my viewModel.