协助dblquad集成，TypeError

Question

gridView3.Columns[0].FieldName = "pis_ExpireDate";

var EXdates = DB0201.purchases_item_seriels
    .Where( u => ( u.stitems_ID == ItemID 
                   && u.ss_StoreID == StoreID 
                   && (u.pis_Statues == 0 || u.pis_Statues == 5 || u.pis_Statues == 6 ) ))
    .OrderBy( o => o.pis_ExpiraeDate ).Distinct().Select( a => new { pis_ExpireDate = a } )
    .ToList();

gridControl3.DataSource = EXdates;

当我尝试运行此代码时出现以下错误，但我无法弄清原因：“ TypeError：只有大小为1的数组可以转换为Python标量”任何帮助将不胜感激