[DbEntityValidationException: Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.]
System.Data.Entity.Internal.InternalContext.SaveChanges() +169
System.Data.Entity.Internal.LazyInternalContext.SaveChanges() +27
System.Data.Entity.DbContext.SaveChanges() +20
UWebs.MvcApplication.Session_Start(Object sender, EventArgs e) in D:\Toan\Code\web200\web200\VNPTWebV2\UWebs\Global.asax.cs:121
System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +10073956
System.Web.SessionState.SessionStateModule.CompleteAcquireState() +165
System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +1126
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +297
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +163
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