Error, "Unable to cast object of type 'DevExpress.XtraReports.UI.ReportPrintContextWin' to type ' (4229207)

I'm trying to setup and schedule an automation script where a standard report is generated and then the report is e-mailed out.

I can test run the report, but as soon as I schedule the script, I get the following message in the output window:

Unable to cast object of type 'DevExpress.XtraReports.UI.ReportPrintContextWin' to type 'DevExpress.XtraReports.UI.ReportPrintContext'.
-- 10/4/2011 11:53:54 AM: Person_Script.log: at DevExpress.XtraReports.UI.ReportRuntime.ContextDictionary`1.CreateInstance(String asmName, String typeName)
-- at DevExpress.XtraReports.UI.ReportRuntime.ContextDictionary`1.GetContext(Type reportType)
-- at DevExpress.XtraReports.UI.ReportRuntime.CreatePrintTool(XtraReport report)
-- at DevExpress.XtraReports.UI.XtraReport.get_ReportPrintTool()
-- at DevExpress.XtraReports.UI.XtraReport.CreateDocument(Single progressRange, Boolean buildPagesInBackground)
-- at DevExpress.XtraReports.UI.XtraReport.CreateDocument()
-- at Quest.Toad.Workflow.Activities.Database.ToadReportActivity.ExportReport()
-- 10/4/2011 11:53:54 AM: Person_Script.log: Failed

At times afterwards, the test run may not work as I get a running process in the background that keeps going and going until I click on the red 'X' to stop the process and then I'll get the message:

Toad Data Reports cannot be cancelled.

Then the same "Unable to case object of type" error occurs again when testing or scheduling the script.