Missing Parameter Values - Passing to Stored Procedure

I have a report databinded via a stored procedure. I am needing to send an id, begin date and end date. The parameters that the stored procedure has are:

?@id
?@begdate
?@enddate

The report also has several subreports that are each databinded with the stored procedure and then are linked by ?@id.


I am trying to send it via the following code:

report.SetParameterValue("@id", id);
report.SetParameterValue("@begdate", begDateCR);
report.SetParameterValue("@enddate", endDateCR);
 
report.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, false, "statement");

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However, I am receiving the error:

System.Runtime.InteropServices.COMException: Missing parameter values.

The report looks good and works when I run it within the "Main Report Preview" window and set the values, however, the error at runtime.