[ArgumentOutOfRangeException: StartIndex cannot be less than zero.
Parameter name: startIndex]
System.String.Substring(Int32 startIndex, Int32 length) +13148758
System.String.Substring(Int32 startIndex) +16
DotNetNuke.Modules.Repository.MakeThumbnail.Page_Load(Object sender, EventArgs e) +1678
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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