Server Error in '/' Application.

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Line 202:
Line 203:        Dim dtrf = New DateTimeRangeFormatter()
Line 204:        myDateVerbose = dtrf.FormatDateRange(myStartDate, myEndDate)
Line 205:
Line 206:        'live URL from web.config app setting

[InvalidCastException: Conversion from string "" to type 'Date' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToDate(String Value) +1577630
   Functions.getNextEvent(String eventType) in C:\websites\sites\my.ldrasoftware.co.uk\App_Code\functions.vb:204
   ASP.feeds_upcomings_aspx.Page_Load(Object sender, EventArgs e) in C:\websites\sites\my.ldrasoftware.co.uk\feeds\upcomings.aspx:18
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533