[InvalidOperationException: A relationship multiplicity constraint violation occurred: An EntityReference expected at least one related object, but the query returned no related objects from the data store.]
System.Data.Objects.DataClasses.EntityReference`1.Load(MergeOption mergeOption) +688
Firelab.Core.DBEngine.Save(Apteka7yaContext context, String callMethod) +822
Firelab.Core.DBEngine.AddProductInOrder(Guid orderId, Guid productId) +2777
WebApp.Cart.AddProductInCart(Guid productId) +478
WebApp.Cart.Page_Load(Object sender, EventArgs e) +572
System.Web.UI.Control.OnLoad(EventArgs e) +106
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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