Publishing to web creates a "Failed to open a rowset"

I have a report that works flawlessly on my personal system, but when I passed it over to IT for them to put up on the company intranet, the report generates a "Failed to open a rowset" error message with some cryptic comments afterwards...

Version of Crystal Reports used is 9, and here's the exact error message; can anyone give me some clues as to what's occuring here?:

Failed to open a rowset.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: CrystalDecisions.CrystalReports.Engine.InternalException: Failed to open a rowset.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InternalException: Failed to open a rowset.]

. I(String , EngineExceptionErrorID ) +642

. D(Int16 , Int32 ) +537

CrystalDecisions.CrystalReports.Engine.FormatEngine.Export(ExportRequestContext reqContext) +469

CrystalDecisions.CrystalReports.Engine.FormatEngine.Export() +107

CrystalDecisions.CrystalReports.Engine.ReportDocument.Export() +67

Bird.RPT_Params.Export(String exportFormat, ReportDocument crReportDocument) +462

Bird.RPT_Params.DisplayReport() +910

Bird.RPT_Params.btnDisplay_Click(Object sender, EventArgs e) +5

System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108

System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57

System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18

System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33

System.Web.UI.Page.ProcessRequestMain() +1292

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Version Information: Microsoft .NET Framework Version:1.1.4322.2407; ASP.NET Version:1.1.4322.2407