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iCal Exporter: System.NullReferenceException

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Hello All. Using iCal Exporter on Sharepoint 2010. Was working perfectly until all the sudden we get an "Unknown Error". Looking up the correlation ID in the logs I see the following error:
 
System.NullReferenceException: Object reference not set to an instance of an object. at ASP._layouts_ical_aspx.WriteEvent(SPListItem item, String timeZone, Hashtable idToGuid) at ASP._layouts_ical_aspx.Page_Load(Object Sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
 
I suspect there's an issue parsing an event, but I'm not sure where to begin looking at this any thoughts?

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