InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate) at MaxShop.UI.Models.Product.ProductViewModel.get_DefautSelectedSize() in C:\BuildAgent\work\2b44690926170532\Website\MaxShop.UI\Models\Product\ProductViewModel.cs:line 91 at MaxShop.UI.Models.Product.ProductViewModel.<>c__DisplayClass70_0.b__0(ProductDetailStatusSkuViewModel x) in C:\BuildAgent\work\2b44690926170532\Website\MaxShop.UI\Models\Product\ProductViewModel.cs:line 64 at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate) at MaxShop.UI.Models.Product.ProductViewModel.get_DefaultSelectedSkuId() in C:\BuildAgent\work\2b44690926170532\Website\MaxShop.UI\Models\Product\ProductViewModel.cs:line 65