Error in Crystal reports with Linq to SQL

rptStudyCertificate rsc = new rptStudyCertificate();
            using (DataClasseDataContext db = new DataClasseDataContext())
            {
                var list = (from data in db.StudyCertificates
                            join clsdet in db.StudentClassDetails on data.AdmissionNo equals clsdet.AdmissionNo
                            where data.ID == Convert.ToInt16(sno)
                            select new { ID = data.ID, Class = clsdet.Class, AcademicYear = clsdet.AcademicYear, AdmissionNo = clsdet.AdmissionNo, Conduct = data.Conduct}).FirstOrDefault();


                if (list != null)
                {
                    rsc.SetDataSource(list);
                    CrystalReportViewer1.ReportSource = rsc;
                }
            }

rsc.SetDataSource(list);

error is: The data source object is invalid.