I got a problem with reporting services, running local rdlc files on the 2005 version.
I have in the HTML a report viewer set to run locally as follows :
I was getting the same problem when I add parameter in rdlc but not assigning it. I solved by adding this code.
Dim p_Date As Microsoft.Reporting.WebForms.ReportParameter
p_Date = New Microsoft.Reporting.WebForms.ReportParameter("DATE", txtDate.Text)
Me.ReportViewer1.LocalReport.SetParameters(New Microsoft.Reporting.WebForms.ReportParameter() {p_Date})
ReportViewer1.LocalReport.Refresh()