Logon failed error when pushing data from dataset

Hi,
I am trying to embed a Crystal report in an ASP.NET 2005 web page, but every time I run the page I get the following error:
Logon failed. Details: crdb_adoplus : Object reference not set to an instance of an object. Error in File C:\DOCUME1\PB_IT_AN\ASPNET\LOCALS1\Temp\DIPSummary {DC347D6B-44F8-441F-8940-4A16ACB54E76}.rpt: Unable to connect: incorrect log on parameters.
I have set up the report using a simple xsd schema in my project which corresponds to the data being extracted from the database (SQL Server 2000) elsewhere within the project. This is being populated into a datatable (dtPCDipSummary) which is then put in a dataset and used as the data source for the report. My code is as follows:
                DSDipSummary.Tables.Add(dtPCDipSummary);
                oRpt.Load(Server.MapPath("DIPSummary.rpt"));
                oRpt.SetDataSource(DSDipSummary);
                crvDIPSummary.ReportSource = oRpt;
                crvDIPSummary.DataBind();
I don't understand what the report is trying to log on to, as the only thing it points to is the schema definition within the project - no reference to an external database.
I have scanned through numerous references to the same error on the internet and tried everything I thought might help but without success.
Please can someone point me in the right direction to get a solution to this?

I deleted the report completely and rebuilt it from scratch, and also added names for the data table and data set generated within the project and finally, success!
Jason, thanks so much for your help which got me moving on this again.

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I deleted the report completely and rebuilt it from scratch, and also added names for the data table and data set generated within the project and finally, success!
Jason, thanks so much for your help which got me moving on this again.

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