Sql reports error 2008

Hi guys, I am running some code, adjusting my report settings too much, but getting the following error in Visual Studio 2008:

Client found response content type '' but expected 'text / xml'. \ R \ nVerify request with empty response. "System.Exception {System.InvalidOperationException}

This only happened recently, I'm guessing it's because I am running sql 2008 and not 2005 like on other machines here?

here's the line of code where the error occurs:

ReportParameter[] expectedParameters = 
_ReportServerClient.GetReportParameters(report, null, false, null, null);