Unknow Database Connector Error

I have a report with subreport, and it has command based database table, I am getting this error messagebox with below code while viewing the report:

foreach (CrystalDecisions.CrystalReports.Engine.Table table in ReportDocument.Database.Tables)
                {
                    TableLogOnInfo tableLogOnInfo = table.LogOnInfo;
                    tableLogOnInfo.ConnectionInfo = ConnectionInfo;
                    table.ApplyLogOnInfo(tableLogOnInfo);
                    string location = "DBO" + "." + table.Location;
                    table.Location = location;
                 }

if i comment the below code, i am not getting the error messagebox. But i need to add the below code to get the commandtext from subreport else i wont be able to get the commandtext from subreport.

string location = "DBO" + "." + table.Location;
table.Location = location;

Requirement

how do i fix this error message box without commenting the above two line

Thanks,

Samson