SSRS 2008 Problem : Message: Invalid URI: The Authority/Host could not be parsed

Hi all:
I am getting a very strange error in my application.


So now, I can actually view the reports in the IE browser, by going to http://localhost/ReportServer and browse the data source and so on.

However, when I launch my application and try to access the same reports via my app, I am getting the error below. Is it something with IIS that I need to configure? Can somebody Help? Thanks. Not sure if people will still answer, since it is the holiday season.

Message: Invalid URI: The Authority/Host could not be parsed.

Data: System.Collections.ListDictionaryInternal

TargetSite: Void CreateThis(System.String, Boolean, System.UriKind)

StackTrace: at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)

at et.UI.Reports.Viewer.RSReportViewer.LoadReport(Environment& env, etReport& report)

at et.UI.Reports.Viewer.ReportTabPage.LoadReport(Environment& env, etReport& report)

at et.UI.Reports.Viewer.ReportViewer.GenerateReport(etReport& report)

at et.UI.Reports.Viewer.ReportViewer.LoadReport(Int32 reportID, etReportTypeEnum reportType, Object[] values)