at System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate)
at Ecommerce.Product.get_OutOfStockCombinations() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 790
at Ecommerce.ActionProductAddToWaitingList.Render(TextWriter w) in C:\Bone\Ecommerce\src\DBItems\Product\Actions\ActionProductAddToWaitingList.cs:line 186
at Bone.Action.RenderContent(TextWriter w) in C:\Bone\Bone\src\Actions\_Action.cs:line 402
at Bone.LayerAction.RenderPage(TextWriter w) in C:\Bone\Bone\src\Actions\Layer.cs:line 157
at Bone.Asp.Render(HtmlTextWriter w) in C:\Bone\Bone\src\Classes\Asp.cs:line 82
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)