excuus voor het ongemak
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Errormessage:
An error occurred loading site properties.

StackTrace:
at VWA.Controls.Base.VWABasePage.get_SiteSettings()
at VWA.Controls.Base.VWABasePage.get_SSOUserID()
at VWA.Controls.Base.VWABasePage.Page_PreInit(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Web.UI.Page.OnPreInit(EventArgs e)
at System.Web.UI.Page.PerformPreInit()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

InnerException:
An item with the same key has already been added.