Server Error in '/' Application.

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[IdentifierNotUniqueException: An object's identifier must be unique (or empty). Identifier=13243.  Existing object is of the type 'CmoEnovaCustomer']
   Wipcore.Core.CmoObject.Update(CmoContext context, CmoObject newObj, String comment, Boolean force, WipSyncState syncState) +707
   Wipcore.Core.CmoUser.Update(CmoContext context, CmoObject newObj, String comment, Boolean force, WipSyncState syncState) +420
   Wipcore.Core.CmoCustomer.Update(CmoContext context, CmoObject newObj, String comment, Boolean force, WipSyncState syncState) +738
   Wipcore.Core.CmoObject.Save(CmoContext context, CmoObject newObj, String comment) +52
   Wipcore.Core.SessionObjects.BaseObject.SaveInternal(String comment, Boolean checkTimestamp) +239
   Wipcore.Core.SessionObjects.BaseObject.Save(String comment) +78
   Wipcore.Core.SessionObjects.Addressable.Save(String comment) +23
   Wipcore.Enova.Core.EnovaCustomer.Save(String comment) +155
   CustomerHelper.CreateCustomer(EnovaCustomer& customer, String& password) +747
   CartAlt_CreateOrder.RefreshFromForm() +238
   CartAlt_CreateOrder.SubmitButton(Object sender, EventArgs e) +38
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +115
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +140
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +29
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2981