Logon failed. Details: crdb_adoplus : Error Help

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Hi

Can anyone help with the following error:

Logon failed. Details: crdb_adoplus : Object reference not set to an instance of an object. Error in File d:\TEMP\rptQtyProcessed {EF9818A5-371D-4049-B6A8-C43229AE0A22}.rpt: Unable to connect: incorrect log on parameters.

The report work fine but when you try and go to the next page or print i am getting the above error, i am using a datatable in a dataset to populate the report code is below

dsQtyProcessedReportTableAdapters.usp_rptQtyProcessedTableAdapter taReport = new

dsQtyProcessedReportTableAdapters.usp_rptQtyProcessedTableAdapter();

DataTable dtReport = new DataTable();

dtReport = taReport.GetData(dteStart,dteEnd,strSite,strOption);

crsQtyProcessed.ReportDocument.SetDataSource(dtReport);

crsQtyProcessed.DataBind();

thanks