An error has occurred during report processing

ex.Message: An error has occurred during report processing.

ex.Source: Microsoft.ReportViewer.WebForms ex.StackTrace:  

at  Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings)

at  Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)

at  Microsoft.Reporting.WebForms.LocalReport.Render(String format, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)

http://social.msdn.microsoft.com/forums/en-US/vsreportcontrols/thread/5d58c5bf-374d-488d-bc8e-43cd99b0be83/

I was finally able to find the "inner exception" info. Here's what i added:

Try

    report.Render("Image", deviceInfo, AddressOf CreateStream, warnings)

Catch e As System.Exception

   Dim inner As Exception = e.InnerException

   While Not (inner Is Nothing)

      MsgBox(inner.Message)

      inner = inner.InnerException

   End While

End Try

catch (Exception ex)
        {
            Exception inner = ex.InnerException;
            string messages = "";
            while (inner != null)
            {
                messages += "; " + inner.Message;
                inner = inner.InnerException;
            }

             MsgBox(messages );

        }

The second line above is from the code posted about printing without print preview so the try-catch block goes around it. I was finally able to determine the error occurring which was a datasource had not been supplied (which was but the name didn't exactly match). Anyway, the report successfully printed this afternoon without a print preview!!!